SRAM Universal Derailleur HangerThis rear mech hanger protects your derailleur against chain jams by pivoting back and out of the way and slips slightly when encountering impacts. SRAM has also ensured that it will work with all drivetrains and improve shifting performance as well as guarantee better alignment. Plus, if you ever need replacement, it will be available everywhere. The UDH. One hard-working hanger.- The Universal Derailleur Hanger - or UDH - consolidates thousands of mountain bike derailleur standards- It offers unparalleled derailleur protection. And perfect alignment. Guaranteed- The UDH is designed to rotate rearward in the event of impact and features the ability to “re-rail” the chain back onto the small cog- The UDH works with all commercially available MTB and E-MTB drivetrains from Shimano to Box to SunraceFeatures: Material: Aluminium Use: MTB, E-MTB Protects against chain jams Improves shifting performance Guarantees better alignment Works with all drivetrains Part Number: AC-DRHG-MTB-A1Buy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.