1Made of quality materials, high strength, anti-rust, non-deformation and durable 2CNC machining makes the surface smooth and can prevent abrasion damage 3With this adapters, you can change 100*15mm front hun into 110*15mm, and 142*12mm rear hub into 148*12mm 4Comes with necessary fittings, easy to install and use 5Useful accessory for bike lovers to DIY bikeFeatures: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 AlloyColor: Shown as pictureOptions: for Front ; for RearFit 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 0.12inchWeight: Approx. 28-33gPackage List:1 x Bike Hub 2 x Washers 6 x Screws