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 495 lb Load Rating 1 Number of Wheels Roller 5 1/2 in Mounting Height 4 in Wheel Dia 1 3/8 in Wheel Width Nylon Wheel/Tread Material 80-85 Shore D Wheel/Tread Hardness Hard Yes Non-Marking