Bolt-Hole Caster, 1/2 in Bolt Hole Dia., 1/2 in Mounting Bolt Dia., Stainless Steel Caster Frame Material, Stainless Steel Frame Finish, 300 to 999 lb Load Rating Range, 330 lb Load Rating, 1 Number of Wheels, Roller, 4 in Mounting Height, 3 7/8 in Wheel Dia., 1 1/2 in Wheel Width, Rubber Wheel/Tread Material, 65 Shore A Wheel/Tread Hardness, Soft, Yes Non-Marking