Caster HQ's TOTAL LOCKING Series swivel casters with 3 inch Blue Solid Polyurethane wheels feature a heat treated ball bearing raceway and a bright zinc plated finish. These casters are ideal for light and medium duty material handling, carts, equipment, and shop projects. Polyurethane wheels provide great protection for floors in commercial and industrial settings. Blue Solid Polyurethane wheel features an extreme resistance to water, oil, and grease. Being non-metallic, these polyurethane wheels are also spark proof. Multiple Threaded Stem Options 300 lb capacity per caster. Features PRICED FOR OEM & HIGH-VOLUME USAGE NON-MARKING CORROSION & CHEMICAL RESISTANT 3/8" AXLE & NUT ZINC PLATED CASTER MASSIVE INVENTORY TOTAL LOCKING CASTER