These casters are built with a high capacity all-weather polyurethane wheel designed to thrive in all conditions. Precision bearings and 1/4" steel construction means that these casters are ready to provide premium performance in your application. Popular uses include; various carts, trucks, dollies, racks & equipment for almost every industry including industrial, warehousing, hospitality, institutional, food service, food processing, retail displays, and endless other applications. This listing contains two rigid casters and two swivel casters with brake. Caster Rig Features: Double ball raceways offer smooth swiveling action, strength and long service life. Standard 5/8” nut & bolt kingpin. Zinc plated finish is attractive & corrosion resistant. Zerk grease fitting in raceway & axle for maintenance. Polyurethane Wheel Features: Patented poly-on-poly construction provides extreme durability. Equipped with Dual Quad X precision ball bearings to achieve effortless mobility and smooth quiet performance. Will not flat-spot, rust, or corrode. Attractive blue on cream color.