Shimano XT M8100 Rapidfire Shift Lever for Front Derailleur.The trigger in the XT M8100 is on the left side and controls the front derailleur. It is mounted with a clamp, so you can put it exactly where you want on the handlebars.There is only one button on the trigger, so depending on which way you press it, whether it shifts up or down. Compared to the previous XT trigger, it is, according to Shimano, 20% faster.It is light and responsive, so you don't have to use extra energy on your shifts, so you can keep control and concentration on the track.A gear cable with the shift lever is included.