"This Whiteside Convertible Creeper Seat easily converts from a creeper to a comfortable seat with back support. Six 2.5in. oil-resistant rollers provide smooth mobility. U.S.A. Wheel Thickness in. 3/4, Capacity lbs. 570, Material Polyolefin, Foldable No, Caster Size in. 2 1/2, Padded Yes, Wheel Diameter in. 2 1/2, Dimensions L x W x H in. 40 x 17 x 5, Ground Clearance in. 2, Adjustable in. No. Positive locking mechanism with push-pin release Rugged 3/4in. frame with rust-resistant finish 2in. ground clearance 570-lb. capacity"