Strong aluminum frame weighs only 8-1/2 lbs. and enables you to move, spin and shift your leverage to different positions Adjustable seat allows you to roll to move instead of crawling and bouncing on your knees Features 3 in. Polyurethane casters and tool tray Thick foam kneepads Adds speed and comfort to those tedious kneeling jobs The Racatac is an innovative kneeling/sitting creeper that enables you to roll around and work in a one or two knee position while taking pressure off of your knees, feet and back.