Contains 2 Swivel Casters with brakes, and 2 rigid casters without brakes. This series is made of 1/4 thick cold rolled steel; designed, formed, and welded for optimal mobility and made to withstand the rigors and abuse typically seen in Medium duty applications.Double Ball raceways and a 5/8 nut & king-pin are standard features. Popular applications may include; various carts, trucks, dollies, racks & equipment, for almost every industry including industrial, warehousing, hospitality, institutional, food service, food processing, retail display, and countless other medium duty applications. Polyurethane Wheels - STEEL ZINC PLATED FRAME. Listing and template services provided by inkFrog. This item is in the category "Business & Industrial\Material Handling\Casters & Wheels\Casters". The seller is "casterhq" and is located in this country: US.