Shock-Absorbing Bolt-Hole Caster 1/2 in Bolt Hole Dia 1/2 in Mounting Bolt Dia Steel Caster Frame Material Chrome Plated Frame Finish 0 to 299 lb Load Rating Range 220 lb Load Rating 1 Number of Wheels Precision Ball 6 5/16 in Mounting Height 5 in Wheel Dia 1 1/4 in Wheel Width Thermoplastic Rubber Wheel/Tread Material 90 Shore A Wheel/Tread Hardness Firm Yes Non-Marking