Listing is for a set of four (4) Service Caster Series #92 swivel casters, four (4) swivel casters with side lock brakes and bolt on swivel locks, 10" diameter, 3" wide red polyurethane tread set on metal core wheels. Supports 12000 total pounds (lbs) at 3000 pounds (lbs) per caster. Non Marking/Non Marring. When searching for a reliable and durable solution for extra heavy duty projects consider Service Caster’s Series 92 top plate polyurethane casters. The Service Caster Series #92 is ideal for cranes, gantry, hoists, winches, material handling, carts, equipment, and shop projects. The non-marking, non-marring polyurethane tread performs especially well on hard surfaces such as concrete, tile, and wood, while the metal core wheel stands up to heavier loads with a stable and secure roll. Featuring a Kingpinless hot forged ASTM1045 steel design that increases caster durability and integrity, the series 92 eliminates problems associated with kingpin failure due to severe shock loading. In addition, the Kingpinless design features ½” diameter HRC45 steel ball bearings which absorb thrust and load in severe environments. Lastly, Service Caster’s Series #92 top plate casters are finely crafted with zinc plating, grease fittings, and 4 position notches to accept 4-position locks. These highly versatile casters are ideal for a wide range of applications, such as dollies, platform trucks, warehouse carts and freight terminals. Even drywall carts, welding carts, and wall panel carts will be ready to roll on the Series 92, keeping you moving forward. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.