Featuring swivel kinpinless construction, Spinfinity™ Casters incorporate large internal seal made of Nitrile butadiene rubber that is completely enclosed inside swivel assembly, keeping grease in and contaminants out. Raceways are CNC-machined and hardened to uniform depth, while top plate and inner raceway are one forged steel piece. Featuring 2 in. wide wheels, ZFWH and ZFHS Series offer capacity of 2,500 lb and 3,000 lb, respectively. ZFFM Series has 3 in. wide wheels and 3,200 lb capacity.