Corrosion-Resistant Bolt-Hole Caster 1/2 in Bolt Hole Dia 1/2 in Mounting Bolt Dia Stainless Steel Caster Frame Material Stainless Steel Frame Finish 300 to 999 lb Load Rating Range 330 lb Load Rating 1 Number of Wheels Roller 4 in Mounting Height 3 1/16 in Wheel Dia 1 1/4 in Wheel Width Nylon Wheel/Tread Material 70 Shore D Wheel/Tread Hardness Hard Yes Non-Marking