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Listing is for 1 (One) Service Caster 4" x 2" Polyurethane on Poly core caster wheel. 500 pound capacity per wheel. Roller Bearing with 1/2" Bore. High capacity, lightweight poly wheel features a polyurethane wheel tread permanently interlocked by mechanical bonding to the polyolefin core. Wheel tread is non-marking, smooth rolling and quiet. Also, highly resistant to oil, grease, water, and most solvents. Polyurethane tread measures 90-95 Shore (A) Durometer reading. Please Note: For 3/4" axles, simply remove the spanner bushing (reduces 3/4" to 1/2"). For axles requiring 5/8" bore; spanner bushings and bearings in stock, please make certain to leave us a note to build wheel for 5/8" axle.