"One-piece construction eliminates stress build-up. Double ball raceways and seal ring keep lubrication in and dirt out. 2 5/8in. to 3in. x 3in. to 3 5/8in. bolt hole spacing. 3/4in. king pin. Top plate size 4in. x 4 1/2in. Material Type Steel, Mount Height in. 6 1/2, Overall Height in. 6 1/2, Top Plate Dimensions L x W in. 4 1/2 x 4, Wheel Diameter in. 5, Wheel Type Polyurethane/polyethylene core, Bolt Hole Spacing 3-3 5/8 x 2 5/8-3, Capacity lbs. 750, Caster Type Rigid, Casters qty. 1, Finish Type Zinc plated, Foot Brake No, Bearing Type Roller, Wheel Width in. 2. Zinc-Plated Forks with Polyurethane Tread/Polyethylene Core Wheels"
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