Size:100*15 to 110*15 Batteries included?:No Product Dimensions:15 x 15 x 5 cm; 30 Grams Features: - Made of quality materials, high strength, anti-rust, non-deformation and durable. - Superior alloy forged and CNC professional cutting, accurate and durable. - With this adapters, you can change 100*15mm front hun into 110*15mm, and 142*12mm rear hub into 148*12mm. - Comes with necessary fittings, easy to install and use. - Useful accessory for bike lovers to DIY bike. Specification: Material: Aluminium Alloy Color: Shown as picture Options: for Front ; for Rear Fit for 100*15mm to 110*15mm(for front), 142*12mm to 148*12mm(for rear) Size(Optional): Approx. For Front-5.3 x 5.3 x 0.5cm / 2 x 2 x 0.19inch; For Rear-5.3 x 5.3 x 0.3cm / 2 x 2 x 0.12inch Weight: Approx. 28-33g Package List: 1 x Bike Hub 2 x Washers 6 x Screws [Premium Material]: Made of quality Aluminium Alloy materials, high strength, anti-rust, non-deformation and durable [Fine Workmanship]: Alloy forged and CNC machining makes the surface smooth and can prevent abrasion damage [Specification]: Bike hub conversion with this adapters, you can change 100*15mm front hun into 110*15mm, and 142*12mm rear hub into 148*12mm (Optional) [Easy To Install]: Comes with necessary fittings, easy to install and use [Good Accessory]: Useful accessory for bike lovers to DIY bike [Premium Material]: Made of quality Aluminium Alloy materials, high strength, anti-rust, non-deformation and durable [Fine Workmanship]: Alloy forged and CNC machining makes the surface smooth and can prevent abrasion damage [Specification]: Bike hub conversion with this adapters, you can change 100*15mm front hun into 110*15mm, and 142*12mm rear hub into 148*12mm (Optional) [Easy To Install]: Comes with necessary fittings, easy to install and use [Good Accessory]: Useful accessory for bike lovers to DIY bike