Features1This product is only suitable for quick release wheel set. 2Remove the quick-release screw and install the lamp holder directly. 3The headlight mounted on the axle helps improve the overall lighting range. 4If the original quick-release screw is damaged, this lamp holder can also be used as replacement. 5Lightweight and portable. Easy to install.SpecificationFeatures:1. This product is only suitable for quick release wheel set.2. Remove the quick-release screw and install the lamp holder directly.3. The headlight mounted on the axle helps improve the overall lighting range.4. If the original quick-release screw is damaged, this lamp holder can also be used as replacement.5. Lightweight and portable. Easy to install.Specifications:Material: Aluminum AlloySize (Length*Outer Diameter): Approx. 50*20mm/1.97*0.79 InchWeight: Approx. 20 gPacking List:1 * Cycling Hubs HolderPackage List