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 770 lb Load Rating 1 Number of Wheels Precision Ball 5 1/16 in Mounting Height 3 7/8 in Wheel Dia 1 1/2 in Wheel Width Nylon Wheel/Tread Material 70 Shore D Wheel/Tread Hardness Hard Yes Non-Marking