【Adjusting the Height】The upgraded handle design could adjust the height of leveling casters very easy and simple，even if the ground is slightly uneven, our retractable casters can assist you in keeping your equipment in a flat and level position. The maximum adjustment height is 8 mm / 0.3 inch. 【Sturdy and Stable Structure】This T60 industry lifting caster is made of high quality materials: sturdy aluminum alloy housing, galvanized thickened top plate, corrosion-resistant and durable PA wheels, floor-friendly hard rubber pad， which can bear 2200 lbs load capacity totally. 【Easy Steering】Equipped with 360 degree swivel head, workbench caser wheels can rotate in any direction you want, even you work in a tight space, our levling caster can help you solve it. 【Widely Used】This height adjustable machine casters fits for objects that need to be adjusted its height to match the job, such as laboratory equipment, workbench, industrial equipment, medical machinery, communications equipment, heavy furniture, cabinet and so on. Rust resistant, suitable for indoor and outdoor use. 【Package Include】Leveling caster x4 pcs, installation accessories(M6*25 Hex Bolts-16pcs and Nuts-16pcs) Make installation more convenient and simple for you. Leveling Casters Wheel with Ratchet Handle(Green) Height Adjustable Plate Casters Set of 4 Total Load Capacity 2200 Lbs Heavy Duty Industrial Retractable Workbench Casters