4" Rubber Stationary Caster Wheel, Steel Metal Top Plate, Replacement Wheel Details: Quality replacement wheels for mechanic's creeper, service carts, cabinets, stools chairs 4" diameter wheel; smooth, quiet non-marking Heavy duty steel plate stationary base Easy installation ready for your use Description: 4" Stationary Caster wheel is molded with macerated canvas impregnated with high quality phenolic resin under high pressure and temperature. The caster is popular with material handling equipment. The areas of applications for our casters are extensive, such as pallet truck, service cart, shopping cart, hand trolley, hospital equipment, etc.