Material: These wheels are made of high-quality nylon, sturdy and durable. Dimensions and load capacity: The diameter of the nylon caster is 50mm, the stem diameter is 6mm, and the stem height is 15mm. Each caster can hold up to 20kg. Feature: The 360-degree swivel caster provides smooth movement, allowing furniture to be moved easily and effortlessly. Equipped with a brake design, the wheel can be stopped quickly and remains securely in place. Easy to install: Features a threaded screw design for easy replacement of old furniture casters. Simple assembly helps restore functionality to your furniture. (Note: The item being assembled must have compatible screw holes, or the thickness of the wooden or metal mounting plate should not exceed 1 cm.) Perfect for: Coffee table, clothes drying rack, laptop desk, kitchen cart, bookshelf.