Wheel Diameter: 6" (Click link to find similar sized casters)Tread Width: 2-1/2"Material: PolyU on Cast Iron (Usu Red or Green)Load Rating (Per Item): 1500 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"; 1/2" bolt)Bearing: Roller BrngLoad Height: 7-1/2"Swivel Radius: N/AShipping Weight: 13 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