"The Fairbanks Swivel Steel V-Groove Caster has gray powder-coated forks. 2 5/8in. to 3in. x 3in. to 3 5/8in. bolt hole spacing. Top plate size 4in. x 4 1/2in. U.S.A. Material Type Steel, Capacity lbs. 1,200, Top Plate Dimensions L x W in. 4 1/2 x 4, Wheel Type V groove/semi steel, Casters qty. 1, Foot Brake No, Wheel Width in. 2, Wheel Diameter in. 8, Finish Type Gray, Mount Height in. 9 1/2, Bolt Hole Spacing 3-3 5/8 x 2 5/8-3, Caster Type Swivel, Overall Height in. 9 1/2. V-groove 7/8in.W x 7/16in.D 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 Gray powder-coat finish prevents corrosion Rugged V-groove semi-steel wheel 1200 lbs. capacity"