For those who need a 'one size fits all' tire tie down, Mac's offers the Tire Block. A set of three Tire Blocks threaded onto a standard 2" strap keep the strap from migrating off the tire with the rubber 'teeth' that bite into the tire's grooves. When used with an idler and track system, the tire block makes for a very flexible tie-down system. Ideal for commercial carriers. For a street tire, we recommend three per tire.