Shock-Absorbing Bolt-Hole Caster M12 Bolt Hole Dia M12 Mounting Bolt Dia Aluminum Caster Frame Material Powder Coated Frame Finish 0 to 299 lb Load Rating Range 260 lb Load Rating 1 Number of Wheels Precision Ball 6 5/16 in Mounting Height 4 in Wheel Dia 1 7/8 in Wheel Width Polyurethane Wheel/Tread Material 90 Shore A Wheel/Tread Hardness Firm Yes Non-Marking