Plate Caster with Flat-Free Wheels, Load Rating Range 300 to 999 lb, Load Rating 300 lb, Tread Sawtooth, Wheel Dia. 10 1/4 in, Wheel Width 3 1/4 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. 6 13/32 in, Tire Thickness 3 in