Description:Made of high quality aluminium alloy, sturdy, non-deformation, features high strength, resistant to high temperature and abrasion, durable for long time use.Ultralight, adding no burden to bike, good for reducing the weight of bike.Tool-free installation, just insert the adapter into the thru axle hub.It converts 12mm thru-axle hub to standard 10mm quick release skewer.Great accessory for your bike.Specification:Material: Aluminuim AlloyColor: BlackOuter Diameter: Approx. 12mm / 0.47inchInner Diameter: Approx. 10mm / 0.35inchLength: Approx. 135mm/142mm/145mmPackage Includes:1 Piece Bike Quick Release Thru Axle Hub Adapter(4 Pack)Note:1. Please allow a slight color difference between the real item and the pictures due to the difference between monitors.2. Please allow a slight measurement error.Hope for your kind understanding and have a nice shopping day!