Welcome to our store! 1. Fits the front hub axle to open 100mm to 110mm, and the quick release is used to install and fix the wheels. 2. Made of high-quality aluminum alloy, anti-corrosion and not easy to deform, solid and durable. 3. Original standard, direct replacement for old or broken wheels. Guarantees great braking performance. 4. Comes with necessary accessories, spacer and screws, easy to install and convenient to use. 5. To adapt to the corresponding disc brake position and the need to open the gear, the problem of compatibility between the hub and the front fork and the frame is solved. Product type: Boost hub adapter Material: Aluminum alloy Color: Black Specification: Front 15mm hub axle to open 100mm to 110mm Front hub adapter Thickness: Approx. 5 mm / 0.20 inch Front spacer thickness: Approx. 5 mm / 0.20 inch Outer diameter: Approx. 5.2 cm / 2.0 inch Inner diameter: Approx. 3.9 cm / 1.5 inch Area of use: Suitable for the front hub axle to be opened 100 mm to 110 mm, to adapt to the corresponding disc brake position and the need to open the gear, solves the problem of compatibility between the hub and the front fork and the frame. 1 x Boost hub adapter 1 x Pair of spacers 6 x Screws If you find any product problems after receiving the item, such as damage or incorrect quantity of items, please contact us immediately. We do our best to provide you with satisfactory customer service.