Heavy-Duty creeper features roomy working space with extra-long 40 overall length for increased comfort Adjustable headrest with 3 stop positions at 15/30/45-degrees Six 2.5 professional grade Polyurethane swivel casters for smooth, easy rolling over cords, hoses, cracks, and shop floor debris Patented caster bracket distributes weight across a larger area of the frame for maximum strength and durability High density 1.4" thick foam for maximum comfort Viking 40" 6 Wheel Adjustable Head Creeper 400LB Capacity .