General Purpose 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, 395 lb Load Rating, 1 Number of Wheels, Precision Ball, 4 1/4 in Mounting Height, 3 1/16 in Wheel Dia., 1 7/8 in Wheel Width, Polyurethane Wheel/Tread Material, 92 Shore A Wheel/Tread Hardness, Firm, Yes Non-Marking