Wheel Diameter: 6" (Click link to find similar sized casters)Tread Width: 2"Material: Polyolefin LDLoad Rating (Per Item): 1000 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 BrngMisc Options: KingpinlessWheel Locks: Tread brakeLoad Height: 7-1/2"Swivel Radius: 4-1/2"Shipping Weight: 5.05 lbs.Usually Ships in: 1 week (may be affected by quantity ordered)• Single ball bearing, precision machined, hardened & heat treated, “Kingpinless style sealed raceway.” (3.26” diameter raceway with 1/2” ball bearings.) • Eliminates problems associated with kingpin failure. • Legs are formed from 1/4” forged steel and are double welded for strength. • Corrosion-resistant zinc plated finish. • 1/2” diameter axle bolt with lock nut. Zerk grease fitting in axle & raceway. • Applications: Great for applications involving extreme shock loading, towing, moving over cracks, uneven floors, and tarmacs, heavy mobile machinery & equipment, heavy-duty material handling carts, buggies & platform trucks, ground support equipment, heavy duty warehouse and manufacturing plant applications