4 in. 285 lbs. Capacity Polyurethane Single-Bearing Swivel Plate Caster (4-Pack)Remember when you had the perfect wheels. Add some mobility into your DIY project with some WEN Swivel Casters. Made from durable polypropylene with non marring polyurethane treads, these reliable wheels measure in at 4 in. Dia with a 1. 2 in. tread width (100 mm x 31 mm). 6202 ball bearings reduce friction for smooth rolling. Plate measures in at 3. 75 in. x 2. 5 in. (93 mm x 64 mm) with four 12 mm x 8. 5 mm mounting holes. Mounting hardware not