"One-piece construction eliminates stress build-up. Double ball raceways and seal ring keep lubrication in and dirt out. Wheel Width in. 2, Capacity lbs. 500, Caster Type Swivel, Wheel Type Polyurethane/polyethylene core, Mount Height in. 5 5/8, Material Type Steel, Casters qty. 1, Foot Brake No, Wheel Diameter in. 4, Overall Height in. 5 5/8, Bearing Type Roller, Finish Type Zinc plated, Top Plate Dimensions L x W in. 4 1/2 x 4, Bolt Hole Spacing 3-3 5/8 x 2 5/8-3. One-piece fork assures less failure and longer life 3/4in. king pin is orbital cold forged for superior strength and stability Nylon grease seal keeps dirt and debris out of the upper ball raceway Zinc-plated finish assures a bright look and prevents rust Durable polyurethane on polyethylene wheel 500-lb. capacity"
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