Listing is for a set of four (4) Service Caster Series #KP30 swivel casters, two (2) with side locking brakes, with 5" diameter by 2" wide nylon wheels capable of supporting a total weight of 3,600 lbs. (900 lbs./caster). When searching for a reliable and durable heavy duty solution to your caster needs, consider Service Caster’s Series KP30 nylon wheel casters. The Service Caster Series #30 is ideal for medium and heavy duty material handling, carts, equipment, and shop projects. The zinc plated finish provides durability under any condition and the nylon wheels provide very low rolling resistance, show a high resistance to many aggressive substances and under normal operating conditions are maintenance free. Featuring a Kingpinless hot forged ASTM1045 steel design that increases caster durability and integrity, the series KP30 eliminates problems associated with kingpin failure due to severe shock loading. In addition, the Kingpinless design features 3/8” diameter HRC45 steel ball bearings which absorb thrust and load in severe environments. Lastly, Service Caster’s Series KP30 casters are finely crafted with 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 KP30, keeping you moving forward.