Wheel Diameter: 4" (Click link to find similar sized casters)Tread Width: 2"Material: SteelLoad Rating (Per Item): 1400 poundsFinish: ZincConnector Specs: Plate (4-1/2"x6-1/4"; holes: 2-7/16"x4-15/16" slotted to 3-3/8"x5-1/4"; 3/8" bolt)Bearing: Roller BrngLoad Height: 5-5/8"Swivel Radius: 3-13/16"Shipping Weight: 4.75 lbs.Usually Ships in: 1 week (may be affected by quantity ordered)• Case hardened double ball raceways provide extra capacity & durability • Top plate and legs are made out of 1/4” cold forged steel. Machine-welded legs for uniform consistency and strength. • Corrosion-resistant zinc plated finish. • 3/4” Nut and bolt kingpin, 2-1/2” & new 3” fork spacings. • Zerk grease fittings in axle, swivel bearings and most wheels. • Applications: Platform trucks, freight terminal trucks, cargo containers, drying racks, ground support equipment, mobile military equipment, A frame