RWM Casters Signature Premium Rubber Wheel, Precision Ball Bearing, 600 lbs Capacity, 6" Wheel, Dia, 2" Wheel, Width, 2-7/16" Plate Length 1/2" Axle diameter, 2-7/16" hub length, 600lbs capacity Signature premium wheels with sealed precision ball bearing 70 Shore A hardness 1.190" Bore Temperature range from -40 degree F to 200 degree F