Made in the USA Makes installation of snow chains a breeze in snow and ice conditions by positioning your vehicle perfectly for installation of tire chains. The vehicle is driven up on the ramp and the tire rests against a back stop that positions the tire within a built in wheel which cradles the tire in place. - Ribbed bottom to grip snow and ice - 16"L x 7 1/4" W x 3-3/8" H - Heavy Duty Plastic Construction - Works with all chains 5/16 thick and smaller - 7,000# Capacity per Pair -Patent #5,279,346 -Stackable Multipurpose: 1. Tire Chain Ramp 2. Trailer leveling Ramp 3. Low clearance sports car ramp