Plate Caster with Flat-Free Wheels, Load Rating Range 300 to 999 lb, Load Rating 495 lb, Tread Ribbed, Wheel Dia. 6 5/16 in, Wheel Width 1 5/8 in, Inside Bolt Hole Spacing 2-15/16 in x 4-1/8 in, Outside Bolt Hole Spacing 3-5/32 in x 4-9/64 in, Caster Brake Type Total Lock Brake, Caster Product Group Swivel Caster with Total Lock, Caster Sub-Type Swivel, Operating Temperature Range -15 Degrees to 160 Degrees F, Non-Marking No, Wheel/Tread Material Rubber, Tire Rim Dia. 4 in