The Wheel Stop is an innovative way to keep multi-axle trailers from driving away! Simply place between a pair of tires, tighten down, and lock it. The Wheel Stop wedges between the treads to prevent forward and backward movement with only one tool. Much easier than messing with multiple sets of chocks or scraps of 2x4s! Bright yellow construction is hard to lose or leave behind. Steel lock bar and padlock are included for added security. Fits 26 to 30 inch diameter tires with 3 1/2 to 5 1/2 inches of space between treads. Not for use on tractor-trailers or other heavy-duty commecrial vehicles. Made in USA.