Bolt-Hole Caster, 1/2 in Bolt Hole Dia., 1/2 in Mounting Bolt Dia., Steel Caster Frame Material, Zinc Plated Frame Finish, 300 to 999 lb Load Rating Range, 495 lb Load Rating, 1 Number of Wheels, Roller, 6 7/16 in Mounting Height, 5 in Wheel Dia., 1 1/2 in Wheel Width, Phenolic Wheel/Tread Material, 90 Shore D Wheel/Tread Hardness, Hard, Yes Non-Marking