RWM Casters CIR-0420-08 4" Diameter X 2" Width Cast Iron Wheel with Straight Roller Bearing, 800 lbs Capacity, 1/2" Axle Diameter 1/2" Axle diameter, 2-7/16" hub length, 800lbs capacity^Cast Iron wheels with straight roller bearing^Special bore sizes available upon request^Temperature range from -40 degree F to 800 degree F^Painted finish