"Double ball raceway swivel caster with 1/2in. diameter king pin. Zinc-plated, 12-gauge steel fork and top plate. 4in. polyolefin wheel, 1 1/4in. tread width. 3 3/16in. x 4 1/8in. top plate with bolt hole spacing of 2 23/64in. x 3 11/32in. 250-lb. load capacity per caster. Capacity (lbs.): 250 per caster, Wheel Size (in.): 4, Bolt Hole Spacing: 2 23/64 x 3 11/32, Top Plate: 3 3/16 x 4 1/8, Material: 12 gauge steel, polyolefin, Finish Type: Zinc plated, Includes (qty.): 4"
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