One-piece construction eliminates stress build-up. Double ball raceways and seal ring keep lubrication in and dirt out. Corrosion-resistant grey epoxy finish. 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. U.S.A. Capacity (lbs.): 750, Wheel Size (in.): 6 x 2, Mount Height (in.): 7 1/4, Bolt Hole Spacing: 2 5/8 to 3 x 3 to 3 5/8, Top Plate: 4 x 4 /12, Wheel Type: Swivel, Material: Polurethane thread/core wheels, Finish Type: Zinc plated, Includes (qty.): 1 Wheel Size: 6in. x 2in. Mount Height: 7 1/4in. Capacity: 750 Lbs. Bolt Pattern: 2 5/8in. to 3in. x 3in. to 3 5/8in. Top Plate: 4in. x 4 1/2in. Wheel Type: Swivel Zinc-Plated Forks with Polyurethane Tread/Polyethylene Core Wheels