【Heavy Duty Caster】This industrial caster is composed of semi-steel wheels and super-strength cast iron core. This industrial caster is composed of semi-steel wheels and super-strength cast iron core. The Industrial grade STL wheel is a great balance between quality and heavy duty dependability with fortified strength to ensure durability and long lasting performance. 【Caster Size & Capacity】: Heavy Duty Casters Diameter: 5", Width: 2", Top Plate: 4x 4-1/2, Overall Height: 6-1/2. Engineered to hold heavy loads of up to 1000 lbs per caster, these industrial casters are ideal for outdoor use and transporting heavy equipment and objects while maintaining stability. 【Stable Ball Bearing】 Casters contain stable roller bearings for optimal strength, smooth rotation, and high tolerance against vertical shock. The caster housing raceway is equipped with an easy access Zerk fitting grease nipple for added convenience. 【Safe Rolling】The STL wheel works great on wood, tile, brick, stone, and concrete floors. When considering the STL tread, users will notice stellar performance and traction. Our industrial strength coating is safe and non-toxic to repel against wet surfaces and even against harsh chemicals, oils, and grease. 【Multiple Use Applications Include】 : Bakery & Food Service Equipment, Institutional Machinery, Hospitality Carts, Hospital Equipment, Laboratory Equipment, Material Handling Equipment,Office Fixtures, Moving Dollies and Utility and Maintenance Carts. Heavy Duty Industrial Casters