K-Edge SRM Chain CatchersCombination SRM magnet and Profesional Chain CatcherAdjustable magnet-arm for precise alignment with compact and standard cranksetsPrevents missed front shifts and frame damage from a dropped chainFor use with braze-on front derailleurs onlyCompatible with Campagnolo, Shimano and SRAM front derailleursTwo-Bolt radius washer allows chain catcher "finger" adjustment independent of the front derailleur Precision machined, anodized 6061 T6 aluminum22.5 gramsLifetime warranty K-Edge Chain Catcher with Power Magnet Chain Deflector UPC: 858953003711