Manufacturer: Checkers, Manufacturer Part Number: MC4011 The Checkers MC4011 Ultra-Class Mining Wheel Chock represents the pinnacle of safety innovation for the mining industry. This heavy-duty wheel chock is designed specifically for ultra-class mining vehicles, offering superior safety and durability for the largest haul trucks in the mining industry with a capacity to secure vehicles weighing up to 1,600,000 lbs (800 tons). As the lightest ultra-class mining chock available*, the MC4011 is 23% lighter than our previous version, weighing 27 lbs , which makes it significantly easier to lift and install on bumper mounts while meeting NIOSH guidelines for one-person lift above the shoulder. The ergonomic design features an external handle that's easier to reach and grip with gloves, along with an optimized center of gravity for easier carrying and installing. With dimensions of 17.5" x 14.5" x 16", the MC4011 is 7.5 inches shorter than other products on the market, further enhancing maneuverability. It has been rigorously tested on 10% uphill and downhill grades for maximum hold and is designed to meet specific wheel geometry, ensuring positive holding power for the heaviest mining trucks. Constructed from tough HDPE, this wheel chock is resistant to many oils, fuels, solvents, tears, abrasions, and extreme weather conditions. It meets OSHA and MSHA specifications, making it the only chock suitable for safe single-person placement and removal in ultra-class mining operations. Whether for open pit mines, quarries, or large-scale mining operations, the MC4011 addresses critical industry pain points including labor shortages, costly replacements due to corrosive environments, and worker injury risks. Checkers’ MC4011  helps mining operations improve efficiency and ROI while prioritizing worker safety, making it the smart choice for mining operations worldwide. Replacement handle and bracket are available separately. The MC4011 is also available in a non-bracket version - MC4011-NB - for vehicles that already include chock mounting equipment. Product Summary At 27 lbs, the lightest weight of any ultra-class mining chock on the market (as of February 2025) Ergonomic with easy grip handle and center of gravity Compact dimensions of 17.5" L x 14.5" W x 16" H - 7.5" shorter than competing products on the market Rated for vehicles with gross operating weight up to 1,600,000 lbs (800 tons) and tire sizes up to 165 inches in diameter The only ultra-class chock suitable for safe single-person placement and removal (as of February 2025)

Manufacturer: Checkers, Manufacturer Part Number: UC14HM~Rugged construction. ~Durable zinc-plated finish. ~Mounting hardware is NOT included. ~11.85 in X 10.25 in. X 4.75 in., Weight: 2.75 lb. (1.2 kg).

Manufacturer: Checkers, Manufacturer Part Number: UC15HM~Rugged construction. ~Durable zinc-plated finish. ~Mounting hardware is NOT included. ~12 in X 11.5 in. X 4.75 in., Weight: 2.75 lb. (1.2 kg).

Manufacturer: Vestil, Manufacturer Part Number: URWC-25-SSThe Urethane Wheel Chock is bright orange for greater visibility. Incoming and outgoing drivers can easily see for added safety. Safety tread on chock face provides better grip and reduces slippage. There is a mold-in hole through width of chock for attaching chain (chain not included). MFG Part# URWC-25-SS

Manufacturer: Checkers, Manufacturer Part Number: MC3009~Optional studs available for snow and ice. ~Barcode imprinted on back of chock. ~ANSI compliant color illustrations on proper chocking and wheel chock placement in English. ~Meets MSHA specifications. ~Resistant to oils, fuels, and solvents. ~Recessed carrying handle on the backside of the chock. ~Replaceable rubber anti-slip traction pads. ~Mounting hole for ropes, chains or brackets. ~Molded-in “How to Use” guidelines in English. ~Length: 15 in. (38.1 cm), Width: 15.1 in. (38.4 cm), Height: 11 in. (28.0 cm), Weight: 14.5 lb. (6.6 kg). ~Color: Safety Yellow. ~1 Each.

Manufacturer: Checkers, Manufacturer Part Number: MC3010~Optional studs available for snow and ice. ~Barcode imprinted on back of chock. ~ANSI compliant color illustrations on proper chocking and wheel chock placement in English. ~Meets MSHA specifications. ~Resistant to oils, fuels, and solvents. ~Recessed carrying handle on the backside of the chock. ~Replaceable rubber anti-slip traction pads. ~Mounting hole for ropes, chains or brackets. ~Molded-in “How to Use” guidelines in English. ~Length: 17.7 in. (45.0 cm), Width: 15.2 in. (38.7 cm), Height: 10 in. (25.4 cm), Weight: 19 lb. (8.62 kg). ~Color: Yellow. ~1 Each.

Manufacturer: Checkers, Manufacturer Part Number: MC3011~Optional studs available for snow and ice. ~Barcode imprinted on back of chock. ~ANSI compliant color illustrations on proper chocking and wheel chock placement in English. ~A minimum of four MC3011 wheel chocks must be used for gross vehicle operating weights from 855,000 - 1,600,000 lbs. ~Meets MSHA specifications. ~Resistant to oils, fuels, and solvents. ~Recessed carrying handle on the backside of the chock. ~Replaceable rubber anti-slip traction pads. ~Mounting hole for ropes, chains or brackets. ~Molded-in “How to Use” guidelines in English and Spanish. ~Length: 24.6 in. (62.5 cm), Width: 14.5 in. (36.9 cm), Height: 16 in. (40.7 cm), Weight: 32 lb. (14.5 kg). ~Color: Hi-Vis Yellow. ~1 Each.

Manufacturer: Checkers, Manufacturer Part Number: MC3012~Resistant to oils, fuels, and solvents. ~Optional studs available for snow and ice. ~Barcode imprinted on back of chock. ~ANSI compliant color guidelines on proper chocking and wheel chock placement in English. ~Meets MSHA specifications. ~Molded-in “How to Use” guidelines in English. ~Recessed carrying handle on the backside of the chock. ~Replaceable rubber anti-slip traction pads. ~Mounting hole for ropes, chains or brackets. ~Length: 21.9 in. (55.7 cm), Width: 14.9 in. (37.9 cm), Height: 10.6 in. (27.0 cm), Weight: 23.75 lb. (10.8 kg). ~Color: Safety Yellow. ~1 Each.

Manufacturer: Checkers, Manufacturer Part Number: AC3512-P~Impact-absorbing. ~High load-bearing capacity. ~Resistant to aircraft fuels, oils, and lubricants. ~Will not rot, crack or splinter like wood. ~Standard with 1/2 in. x 24 in. replaceable polyester rope lanyard. ~12" Yellow Chock Body 24" X 1/2" Nylon Rope. ~Molded-in high-visibility yellow color. ~1 Pair.

Manufacturer: Checkers, Manufacturer Part Number: AC3512-RP-P~Impact-absorbing. ~High load-bearing capacity. ~Resistant to aircraft fuels, oils, and lubricants. ~Will not rot, crack or splinter like wood. ~Standard with 1/2 in. x 24 in. replaceable polyester rope lanyard. ~12" Yellow Chock Body 24" X 1/2" Nylon Rope. ~Molded-in high-visibility yellow color. ~1 Pair with Rubber Base.

Manufacturer: Checkers, Manufacturer Part Number: AC3515-P~Impact-absorbing. ~High load-bearing capacity. ~Resistant to aircraft fuels, oils, and lubricants. ~Will not rot, crack or splinter like wood. ~Standard with 1/2 in. x 24 in. replaceable polyester rope lanyard. ~15" Yellow Chock Body 24" X 1/2" Nylon Rope. ~Molded-in high-visibility yellow color. ~1 Pair.

Manufacturer: Checkers, Manufacturer Part Number: AC3515-RP-P~Impact-absorbing. ~High load-bearing capacity. ~Resistant to aircraft fuels, oils, and lubricants. ~Will not rot, crack or splinter like wood. ~Standard with 1/2 in. x 24 in. replaceable polyester rope lanyard. ~15" Yellow Chock Body 24" X 1/2" Nylon Rope. ~Molded-in high-visibility yellow color. ~1 Pair with Rubber Base.

Manufacturer: Checkers, Manufacturer Part Number: AC3518-P~Impact-absorbing. ~High load-bearing capacity. ~Resistant to aircraft fuels, oils, and lubricants. ~Will not rot, crack or splinter like wood. ~Standard with 1/2 in. x 24 in. replaceable polyester rope lanyard. ~18" Yellow Chock Body 24" X 1/2" Nylon Rope. ~Molded-in high-visibility yellow color. ~1 Pair.

Manufacturer: Checkers, Manufacturer Part Number: AC3518-RP-P~Impact-absorbing. ~High load-bearing capacity. ~Resistant to aircraft fuels, oils, and lubricants. ~Will not rot, crack or splinter like wood. ~Standard with 1/2 in. x 24 in. replaceable polyester rope lanyard. ~18" Yellow Chock Body 24" X 1/2" Nylon Rope. ~Molded-in high-visibility yellow color. ~1 Pair with Rubber Base.

Manufacturer: Checkers, Manufacturer Part Number: AC3521-P~Impact-absorbing. ~High load-bearing capacity. ~Resistant to aircraft fuels, oils, and lubricants. ~Will not rot, crack or splinter like wood. ~Standard with 1/2 in. x 24 in. replaceable polyester rope lanyard. ~21" Yellow Chock Body 24" X 1/2" Nylon Rope. ~Molded-in high-visibility yellow color. ~1 Pair.

Manufacturer: Checkers, Manufacturer Part Number: AC3521-RP-P~Impact-absorbing. ~High load-bearing capacity. ~Resistant to aircraft fuels, oils, and lubricants. ~Will not rot, crack or splinter like wood. ~Standard with 1/2 in. x 24 in. replaceable polyester rope lanyard. ~21" Yellow Chock Body 24" X 1/2" Nylon Rope. ~Molded-in high-visibility yellow color. ~1 Pair with Rubber Base.

Manufacturer: Checkers, Manufacturer Part Number: AC201~For small aircraft. Impact-absorbing, lightweight urethane. ~Weather and abrasion resistant. ~High load-bearing capacity. ~Resistant to aircraft fuels, oils, and lubricants. ~Optional anti-skid rubber pads for polished hanger floors. ~Will not rot, crack or splinter like wood. ~Sold roped together as pairs. ~5.5 in, Molded-in high-visibility yellow color.

Manufacturer: Checkers, Manufacturer Part Number: RC815-PAllows either side to be positioned against the tire. Eyebolt for ropes and chains. Small design makes for easy storage. Length: 10 in. (25.4 cm), Width: 8 in. (20.3 cm), Height: 6 in. (15.2 cm), Weight: 8.5 lb. (3.9 kg) per single chock. Bottom Void. Color: Black, 1 Pair.

Manufacturer: Checkers, Manufacturer Part Number: RC5510-P~Allows either side to be positioned against the tire. ~Replaceable 24 in. polyester rope lanyard. ~Sold as singles with rope or roped together as pairs. ~Available in 10, 12, 15, 18, 21, and 24 inch lengths. ~Length: 10 in. (25.4 cm), Width: 5 in. (12.7 cm), Height: 4.33 in. (11.0 cm), Weight: 6.5 lb. (3.0 kg) per single chock. ~Color: Black, 1 Pair.

Manufacturer: Checkers, Manufacturer Part Number: RC5512-P~Allows either side to be positioned against the tire. ~Replaceable 24 in. polyester rope lanyard. ~Sold as singles with rope or roped together as pairs. ~Available in 10, 12, 15, 18, 21, and 24 inch lengths. ~Length: 12 in. (30.5 cm), Width: 5 in. (12.7 cm), Height: 4.33 in. (11.0 cm), Weight: 7.7 lb. (3.5 kg) per single chock. ~Color: Black, 1 Pair.

Manufacturer: Checkers, Manufacturer Part Number: RC5515-P~Allows either side to be positioned against the tire. ~Replaceable 24 in. polyester rope lanyard. ~Sold as singles with rope or roped together as pairs. ~Available in 10, 12, 15, 18, 21, and 24 inch lengths. ~Length: 15 in. (38.1 cm), Width: 5 in. (12.7 cm), Height: 4.33 in. (11.0 cm), Weight: 9.3 lb. (4.2 kg) per single chock. ~Color: Black, 1 Pair.

Manufacturer: Checkers, Manufacturer Part Number: RC5518-P~Allows either side to be positioned against the tire. ~Replaceable 24 in. polyester rope lanyard. ~Sold as singles with rope or roped together as pairs. ~Available in 10, 12, 15, 18, 21, and 24 inch lengths. ~Length: 18 in. (45.7 cm), Width: 5 in. (12.7 cm), Height: 4.33 in. (11.0 cm), Weight: 11 lb. (5.0 kg) per single chock. ~Color: Black, 1 Pair.

Manufacturer: Checkers, Manufacturer Part Number: RC5521-P~Allows either side to be positioned against the tire. ~Replaceable 24 in. polyester rope lanyard. ~Sold as singles with rope or roped together as pairs. ~Available in 10, 12, 15, 18, 21, and 24 inch lengths. ~Length: 21 in. (53.3 cm), Width: 5 in. (12.7 cm), Height: 4.33 in. (11.0 cm), Weight: 12.7 lb. (5.8 kg) per single chock. ~Color: Black, 1 Pair.

Manufacturer: Checkers, Manufacturer Part Number: RC5524-P~Allows either side to be positioned against the tire. ~Replaceable 24 in. polyester rope lanyard. ~Sold as singles with rope or roped together as pairs. ~Available in 10, 12, 15, 18, 21, and 24 inch lengths. ~Length: 24 in. (61.0 cm), Width: 5 in. (12.7 cm), Height: 4.33 in. (11.0 cm), Weight: 14.4 lb. (6.5 kg) per single chock. ~Color: Black, 1 Pair.