Built for Strength & Comfort. This body-fitting design was developed through testing on many body types to provide optimum comfort. Creeper body is 2″ longer for a betterfit. Urethane rollers are inserted into steel bushings which are molded into the creeper body. Provides added strength and easy roller replacement. Low profile, 7/8″ floor clearance. Easy to clean surface is resistant to solvents, greases and fuels.