Shimano ST-EF51 Shifter Levers Set 3 Speed / 7 Speed / 3x7 Speed for Bike Bicycle (3 speed) Noise-dampening bumper stopper Right 7 speed, left 3 speed, 21 speed total Suitable for V-brake systems and cantilever brakes (MTB) Trigger type handle,easier to vary speed, with inner cables Suits 22.2mm diameter handle, Allen wrench installation