ATD Tools Heavy Duty Convertible Creeper is a creeper that easily transforms from creeper to shop seat with the pull of one pin. Designed with 40 inch heavy-duty steel frame, six 3 inch polyurethane, oil resistant casters that swivel easily with full ball bearings, fully upholstered pad measuring 40 inch in (Length) x 6-1/2 inch in (Height) x 19 inch in (Width).