MATERIAL: These furniture casters are made of sturdy metal, with a wear-resistant nylon wheel and a durable rubber pad. SIZE AND LOAD CAPACITY: The wheel diameter is 50mm, the installation height is 8.7cm and can be adjusted to 9.5cm. With a 5mm thick top plate, the furniture casters can transport heavy objects. The maximum total load is 1500kg. HEAVY DUTY CASTER WITH FLEXIBLE MOVEMENT: With a 360 degree rotating top plate and double ball bearings, the movement is flexible and easy. HEAVY DUTY CASTER WITH ADJUSTABLE HEIGHT: The manual adjustment knob allows you to adjust the height, move heavy objects easily and ensure anti-vibration performance. The height adjustment keeps items in place even on uneven floors. PERFECT FOR: These furniture casters are perfect for heavy furniture, workbenches, welding tables, automatic dispensers, medical equipment and laboratory equipment