Shimano RevoShift SL-RS35 3/6/7/ 8/21 Speed Twist Grip Shifter Set for MTB
3 Speed Shifter- Only Left Shifter. 6 Speed Shifter- Only Right Shifter. 7 Speed Shifter- Only Right Shifter. The SIS rear index shifting system was adopted at the front. With the index system at the front shifting operation is easier and more comfortable.