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This bicycle 3x7 speed gear shifter with brake set are suitable for most kinds of bicycles including mountain bike, trekking bike, town bike, road bike, Fixed Gear Bike, MTB, etc. How to install: 1. Set the handle at the top position. 2. Unscrew and remove the protection cover. 3. Pull out the interior wiring and install the new one. Specification: Material: Aluminum Alloy Color: Black Item Size: 6.5 x 3.1 inches Hole Diameter: 22mm/ 0.86 inch Package includes: A Pair of Mountain Bike Gear Shifter (3 Speed Left & 7 Speed Right)