Shimano Altus M310 8 Speed Trigger Shifter 3x8 MTB Rapidfire Plus OpticalDisplay

3-Speed Shift Lever Shifter Bike Bicycle Parts for Shimano Acera SL-M310. Type:Left Shifter,Right Shifter,1 pair(Left +Right Shifter). Right shifter is a trigger-type 7 speed shifter, with one lever for down-shifts and a thumb button for up-shifts.