TheShimano Deore M6100 12 Speed I-Spec EV Right Hand Shift Leveris light to the touch but positive and crisp. Vivid indexing provides a constant amount of shift lever force across all 12 sprockets.2-way release allows shifting from various riding positions; the upper lever still performs the same shift function, but it can now swing in either direction allowing it to be released by the thumb or index finger. Shimano Deore M6100 12 Speed I-Spec EV Right Hand Shift Lever Features Dyna-Sys 12-speed compatible - for use with precision 12-speed MTB drivetrains Pod design allows the use of these shifters with any brake lever I-spec-EV design is developed to attach directly to I-spec-EV brake levers Barrel adjuster for fine gear tuning Complete with Optislick inner and SP41 outer cables Easy access clamp band adjustment for quick set up Optional: Supplied with or without easy to read optical gear display