"Step-on lock secures caster wheel and locks swivel in position for optimum scaffold safety. Rubber tire is bonded to cast steel wheel. Zinc-plated, 500-Lb. capacity caster has Zerk fittings for easy greasing. Lock adjusts for wear. 1 3/8in. diameter stem is 4in. long. Plate is 9in. high. Capacity (lbs.): 500, Wheel Size (in.): 8 X 1 3/4, Top Plate: 9, Wheel Type: Double brake swivel, Material: Rubber tire, Quantity: 1 Stem: 1 3/8in. diameter x 4in. length"
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