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 660 lb Load Rating 1 Number of Wheels Precision Ball 4 1/4 in Mounting Height 3 in Wheel Dia 1 1/4 in Wheel Width Nylon Wheel/Tread Material 70 Shore D Wheel/Tread Hardness Hard Yes Non-Marking