Whiteside MTL40RT Mechanic's Creeper, Standard Duty, 570 lb Capacity, 40 in L x 20 1 2 in W x 4 1 4 in H, Steel, 6 Casters 25KK02 Regulator CGA Number (Oxygen) CGA Regulator CGA Number (Oxygen) CGA 540 2 A Includes Filter Number of Levels 1 Regulator Maintains Constant Stream Height at Line Pressures of 20 to 105 psi Mounting Type On Wall Drain Connection 1 1 4 in Operation Push Bar Fountain Creeper Seat Style Creeper Duty Rating Standard Duty Maximum Load Capacity 570 lb Overall Length 40 in Overall Width 20 1 2 in Overall Height 4 1 4 in Height Range 4 1 4 in Frame Material Steel Creeper Material Steel Caster Diameter 2 1 2 in Caster Material Polyolefin Includes (6) Casters Country of Origin United States A creeper is a flat metal or cushioned horizontal surface that a mechanic lays on while fixing the under carriage of a vehicle