The Bone-ster mechanics creeper is the more compact auto creeper that revolutionized working under a car, and its so comfortable and easy-to-use. The patented dog-bone shape that cradles the user between the wheels, about 1-1/4 in. above the ground. Its a proven design that's more durable, more comfortable, less likely to tip and easier to work on than any other creeper on the market. The unique 1-piece body that's molded of the special engineering-grade co-polymer. It is smooth, comfortable, easy to clean, resistant to gasoline, oil and almost all common solvents. The deep, smoothly molded structural ribs add incredible strength and durability without adding bulk and weight, providing welcome ventilation for those hot muggy days when lying on a vinyl pad leaves you with a sweaty back and a bad attitude. 2 molded-in handholds make it easy to carry and easy to secure against theft or serial tool borrowers. Every piece features incredibly strong, custom-molded wheels that are guaranteed for as long as you own the creeper (against manufacturer defects). Wheels are 3 Dia, with oil-impregnated metal center bearings and a molded-in-place 7/8 in. W tire that resists oil, gas and most common solvents. Heavy-gauge, cad-plated steel caster frames have dual race ball bearing swivels and each 1 is thru-bolted to the body with four 1/4 in. Dia, bolts that wont ever tear off, strip out or fall apart.