The Race Ramps Pro-Stops make parking easy in your shop, trailer or driveway. The Pro-Stop parking guide has a low-profile design allowing maximum clearance for lower vehicles and also work well for use with floor or post lifts. Constructed from recycled semi tires the Pro-Stops grip to your floor, even on slippery surfaces like Swisstrax, RaceDeck, painted or epoxied concrete. Easy snap together pieces allow you to combine Pro-Stops for wider tires and pre drilled holes allow you to have the option to permanently mount them to your garage floor. Proudly made in the USA!