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 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 Hub2 x Washers6 x Screws.