[Package Includes]Our set includes 2 washers, 1 main body and 6 bolts, you don't need to purchase additional accessories. Colour: Black [Size]The inner diameter of our gasket is 15mm, the thickness is 5mm, the thickness of the hub adapter is 5mm, and the length of the screw is 14mm. [Material]Our front bicycle power-assisted hub conversion adapter is made of high-quality alloy, which is durable, wear-resistant and not easy to rust. [Application]Our hub conversion adapter is a very important bicycle component, which can convert a 100mm*15mm front hub to 110mm*15mm. [Easy To Install]Our hub conversion adapter is easy to install, comes with the necessary accessories, no complicated steps, and can be easily installed by non-professionals.