Load Capacity: 90-450 lbs per caster. Applications: Recommended for general warehouse and factory applications such as furniture dollies, laundry carts, bakery racks, and tool boxes; a good combination of strength, durability, and economy. Wheel Diameter (Inches): 2, 2 1/2, 3 and 4. Wheel Materials: Dyna-Tred TPR, Dyna-Tred PU, Sintered Iron, Soft Rubber, Hard Rubber, Polypropylene and Phenolic. Swivel Casters: Horn and bearing raceway are formed from a single piece of heavy-guage steel, deeply corrugated to withstand stress and prevent distortion under full rated load. Load Bearing: Single row of hardened, polished ball bearings roll freely in a large-diameter, lubricated raceway. Kingpin: Riveted and coined for durability in rated service. Wheel Bearings: Plain, sealed ball bearings and precision bearings. Finish: Corrosion-resistant zinc.