This product is a screw washer, suitable for hubs, can play a very good elastic fixation, with stronger locking force, can well protect accessories! It is made of aluminum alloy material, which is and does not rust. It will meet your needs is an accessory. Features -Material: Aluminum Alloy -Size: About 1.89X1.89X0.30cm/0.74X0.74X0.12inch -It is made of materials, has a strong structure, durable and will not be easily damaged. -With good fastening function, it can well protect your bike accessories. -The excellent production process makes it have a smooth and comfortable without burrs, can use it with peace of mind. -The product has a wide range of applications, and is an choice for mountain bikes, road bikes, etc. -The light weight of the material is very suitable for reducing the need for riding. Package list: 2 x Washer Fastener