Unique brake lock system incorporates a one–handed easy–pull lever operation that restricts the 4 wheels from moving while you're working on your vehicle. This is an excellent feature when applying pressure to frozen fasteners or working on tight bolts, nuts, oil filters, etc. The 400–lb. capacity King Crawler creeper is a unique “all–terrain” creeper that goes where other creepers can't. 1žin. ground clearance and low center of gravity on four 6in. pneumatic swivel casters with axle bearings allow easily rolling over almost any outdoor, garage or shop surface. Tire pressure adjusts to accommodate surface conditions. 38in.L x 13žin.W cushioned deck is covered with industrial thick vinyl and has a 2žin. thick padded head support. No assembly required. 1–year limited warranty on casters; limited lifetime warranty on remainder. U.S.A.