DROPOUT G, EMERGENCY - This device allows you to get back home should you break your hanger out on the road or trail. Simply remove your broken hanger, derailleur and QR skewer nut. Put the QR skewer through the Emergency Hanger, remove the spring and re-attach the nut. Secure the QR nut and skewer down tightly. Re-attach the derailleur and away you go. - In most cases you should be able to shift throughout half (or more) of your rear cassette range. - Not designed for long term use. - CNC machined 6061 aluminum. - Black anodized finish. - 1 drop out per bag.