Low-Profile Easy-Turn Bolt-Hole Caster 1/2 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 4 1/16 in Mounting Height 3 in Wheel Dia 7/8 in Wheel Width Thermoplastic Rubber Wheel/Tread Material 90 Shore A Wheel/Tread Hardness Firm Yes Non-Marking