Pair Rubber Chock Black 18" X 5" X 5" - Model 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.