Feature: 1. Made of quality materials, high strength, anti-rust, non-deformation and durable 2. CNC machining makes the surface smooth and can prevent abrasion damage 3. With this adapters, you can change 100*15mm front hun into 110*15mm, and 142*12mm rear hub into 148*12mm 4. Comes with necessary fittings, easy to install and use 5. Useful accessory for bike lovers to DIY bike Specification: Features: Made of quality materials, high strength, anti-rust, non-deformation and durable. CNC machining makes the surface smooth and can prevent abrasion damage. 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: 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