This product converts 12mm thru-axle adapter to standard quick release. Tool-Free Installation Just insert the adapter into the thru axle hub and then you can secure the wheel using a standard quick release skewer. Suitable for mountin bike. Features -Material: Aluminum alloy. -Using high-classic aluminum alloy material, high strength, durable, can serve you for a long time. -This product converts 12mm thru-axle hub to standard 9mm quick release. -Both sides of the product added rubber ring, so that it is not easy to shake after installation and will not cause noise. -It is used for the professional axis of bicycles, suitable for home, auto repair shop and other places. -It is compact, portable, easy to carry and use, and can bring you great convenience.