Two Bearings: With 2 bearings, the roller can rotate smoothly and will never jam, which can prevent the rope from breaking due to excessive friction. Silent Pulley Wheel: All parts are installed firmly, and the gaskets are placed in the gaps, do not collide with each other and make metallic noise. The pulley is made of 304 stainless steel, and all parts are thick. It weighs 370g. Self-locking Nut: 18mm. Compared with ordinary nuts, it can resist loosening and vibration. 360 Swivel Ring: The pulley block can be rotated 360 degrees to prevent the rope from tangling. The maximum rope size is 10mm. The pulley is ideal for DIY gym cable pulley system. It runs smoothly and quietly and won't interfere with your and your family's exercise. Also perfect for washing lines, garages, transporting materials, loading machines, etc. Product Advantages The pulley has two bearings. It makes the rotation smooth and comfortable when you use it. The pulley is made of high-density 304 stainless steel. It is very strong. The roller surface is smooth and the structure of the entire pulley is tight, so it won't make metallic noises. The pulley can be rotated 360 degrees to prevent the rope from tangling. You can clean and maintain this pulley easily.