"This Whiteside Creeper with large 6in. No-Matic wheels rolls over any surface, including gravel. Heavy-duty steel frame is powder-coated for resistance to rust. U.S.A. Adjustable in. No, Material Steel, vinyl, Capacity lbs. 600 lbs., Caster Size in. 6, Dimensions L x W x H in. 40 x 24 1/2 x 4 3/4, Foldable No, Ground Clearance in. 3 3/4, Padded Yes, Wheel Diameter in. 6, Wheel Thickness in. 1 1/4. Four 6in. No-Matic wheels roll easily on smooth or rough surfaces 'V' drop in shoulder area for extra comfort Fully padded with heavy-duty vinyl Raised headrest for added support"