MATERIAL: These furniture casters are made of sturdy metal, with a hard-wearing nylon wheel and durable rubber pad SIZE AND LOADING CAPACITY: The diameter of the wheel 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 1000 kg HEAVY DUTY CASTER 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 Product COULTER DETAIL Well-designed, rigid construction for heavy-duty projects Wear-resistant wheel, base supported by NBR and adjustable by ABA Furniture casters These retractable furniture casters are made of sturdy metal, from wheel to hard-wearing nylon and durable rubber pad. It's easy to move heavy items and keep them in place by adjusting the manual knob. It's ideal for heavy furniture, workbench, welding table, vending machine, medical equipment, the laboratory device. Specifications: Color: White Material: metal, nylon wheel and rubber pad < p>Wheel diameter: 50mm Top plate size: 7.2 7.2cm (LW) Bolt hole distance: 5.8 x 5.8cm (L x W) Mounting hole diameter: 7.2mm Height: 8.7~9.5cm Cargo capacity 250 kg per wheel