Listing is for one (1) Service Caster 8" diameter by 2" wide polyurethane wheel capable of supporting 500 lbs. per wheel. 257UB1660 replacement part fits Lavex Industrial U-Boat utility cart. When searching for a reliable and durable solution for high quality replacement Lavex Industrial U-Boat Utility Cart wheels that are non-marking, smooth rolling, and quiet, consider Service Caster's Polyurethane on Polyolefin core wheel. With a roller bearing with 1/2" bore for axle, Polyurethane is highly resistant to oil, grease, water, and most solvents. Non-marking polyurethane tread mechanically bonded to polyolefin core. Hardness scale 55 +/- 5 Shore (D) Durometer. An excellent choice for clean environments. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.