Set Of 4, 8″ X 2 1/4″ Caster Wheels 2 Swivel, 2fixed Heavy Duty STEEL Ball… This set of 4, swivel and 2 fixed units measure 8″ diameter and a thick 2 1/4″. These Flat Free Casters are flat free and made of high density polyethylene materials that never go flat. Tire is ideal for allowing your equipment to move across the toughest of terrains. Zinc plated finish is meant to last. Excellent for trailers, moving Dolly’s and more. Professional graded to last. Please see photos for further details about this item. Please see our other items. We look forward to doing business with you. This item is in the category “Business & Industrial\Material Handling\Casters & Wheels\Casters”. The seller is “frick79″ and is located in this country: US. This item can be shipped to United States.