Bicycle Derailleur Mountain Bike Speed Shift Lever 3x8 Bike Shifter Left Right For SL-M310 MTB Split Finger Bicycle Parts Bicycle Derailleur Mountain Bike Speed Shift Lever 3x8 Bike Shifter Left Right For SL-M310 MTB Split Finger Bicycle Parts Material:alloy Package:1pcs/1pair Size: L 6.2 x W 4.7 x H 4.5 inches Features: 1. Visual window speed change, both hands can fine-tune the speed 2. It is suitable for the installation of line disc variable speed and oil disc variable speed 3.ight shifter is a trigger-type 7 speed shifter, with one lever for down-shifts and a thumb button for up-shifts. 4.Left shifter is a friction / ratcheting thumb lever for triple cranksets. 5.For 7 speed indexed SIS shifting. Optical gear display for convenient verification of gear position _x000D_