Features: Made of high-quality aluminum-alloy,fine-workmanship,strong and durable, long service life. The thread is neat and clear,high hardness,good abrasion resistance,uniform force,and difficult to slide. With anti-skid lines,effectively prevent locking and slipping, and protect the-frame. Equipped with one body non-slip washer, effectively prevent lock slip and protect the-frame.Suitable for bicycles hub drum rear-axle. Nut size:M5-includes:1pcs bike wheel hub axle-nut. Specifications: Material:Aluminum-Alloy Color:Red,Black,Green,Blue,Gold Note: Please allow 1-2cm errors due to manual measurement. Due to the difference betweeen different monitors,the picture may not reflect the actual color of the item. Package includes: 1 Piece Bike Hub Nut