RWM Casters VIR-0420-08 4" Diameter X 2" Width Cast Iron V-Groove Wheels with Straight Roller Bearing, 800 lbs Capacity 1/2" Axle diameter, 2-7/16" hub length, 800lbs capacity V-groove wheels with straight roller bearing Hub length can be cut or lengthened with spacers Temperature range from -50 degree F to 800 degree F