Shimano deore m610 10 speed trigger shifter setdeore mountain bike rapidfire shifter pods featuring 2 way release for cost effective dyna sys 10 speed shifting performance featureslight to the touch but positive and crisp vivid indexing provides a constant amount of shift lever force across all 10 sprockets2 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 th