Low-Profile Easy-Turn Bolt-Hole Caster 33/64 in Bolt Hole Dia 1/2 in Mounting Bolt Dia Steel Caster Frame Material Zinc Plated Frame Finish 0 to 299 lb Load Rating Range 220 lb Load Rating 2 Number of Wheels Precision Ball 3 15/16 in Mounting Height 3 in Wheel Dia 1 in Wheel Width Thermoplastic Rubber Wheel/Tread Material 88 Shore A Wheel/Tread Hardness Hard Yes Non-Marking