K-Edge PRO Road Braze-on Chain Catcher SRM w/Power Meter Magnet Affixed magnet to work with the SRM power crank units Easier Installation  Independent setup and installation of front derailleur and the K-EDGE Chain Catcher Stronger  Separate and lower attachment /adjustment bolt equates to stronger hold ensuring the chain cannot drop below the chain catcher Optimized Design  Unique curved ramp profile enables quicker chain engagement with the chain ring while eliminating dropped chains Made in USA, Lifetime Guarantee against material or manufacture defects. Damages due to abuse, incorrect installation, or crashes excluded.