Wheel Diameter: 4" (Click link to find similar sized casters)Tread Width: 1-1/4"Material: PolyU on PolyO (Gray)Load Rating (Per Item): 250 poundsFinish: ZincConnector Specs: Threaded Stem (3/8"-16TPI x 1-1/4")Bearing: Ball BrngMisc Options: Thread guardsLoad Height: 4-15/16"Swivel Radius: 3-1/4"Shipping Weight: 1.55 lbs.Usually Ships in: 1 week (may be affected by quantity ordered)• Economy Series. • Capacity up to 250 lbs. • Case hardened double ball raceways. • Applications: Light-duty material handling equipment, food service carts & equipment, bakery racks & equipment, institutional carts & equipment, miscellaneous dollies, mobile cases, displays, mobile wire racking, stock carts, textile applications, warehouse & manufacturing applications.