MATERIAL: These furniture casters are made of sturdy metal, with a hard-wearing nylon wheel and durable rubber pad SIZE AND LOADING CAPACITY: Wheel diameter is 50mm, the installed height is 8.7cm and it can be adjusted to 9.5cm. With a 5mm thick top plate, the furniture casters can transport heavy items. Maximum total load is 1500 kg HEAVY DUTY CASTOR WITH FLEXIBLE MOVEMENT: With a 360 degree swivel top plate and double ball bearings, movement is flexible and easy HEAVY DUTY CASTOR WITH ADJUSTABLE HEIGHT: Manual adjustment knob allows for height adjustment, easily moving heavy objects and ensuring anti-vibration performance. Height adjustment also helps keep items in place, even on uneven floors PERFECT FOR: These furniture casters are perfect for heavy furniture, workbenches, welding tables, vending machines machines, medical equipment, laboratory apparatus