Shimano Deore SL-M610 10 Speed Shift Lever - Right Hand Side - I-SpecShimano Deore SL M610 10 Speed Shift Lever Right Hand Side I Spec This shifter is specifically designed for fast paced MTB rides as it offers light and responsive shifting for all riding styles. It features a 2 way release function which allows for relief shifts by either the pull of the index finger or the push of the thumb. One final highlight is Shimano's I SPEC B mounting system which creates a cleaner and lighter bar set up. Please Note: This