Plate Caster with Flat-Free Wheels Load Rating Range 0 to 299 lb Load Rating 275 lb Tread Sawtooth Wheel Dia 8 1/2 in Wheel Width 2 7/8 in Inside Bolt Hole Spacing 4 in x 4 in Outside Bolt Hole Spacing 4-7/16 in x 4-7/16 in Caster Brake Type No Brake Included Caster Product Group Swivel Caster Caster Sub-Type Swivel Operating Temperature Range -40 Degrees to 180 Degrees F Non-Marking Yes Wheel/Tread Material Polyurethane Tire Rim Dia 4 39/64 in Tire Thickness 2 in