Features:1. The left hand supports three gear selectors and the right handle seven gear levers, easy to adjust the speed.2. The visual transmission position display ensures that the gear shift is clear at a glance.3.21 speed mountain bike variable speed controller transmission one-piece brake.4.3x 7 speed change brake handle provides ergonomically designed finger position and trigger style handle.5. Suitable for MTB, city car, leisure vehicle, car, foldable and so on. Specification: Item Type: Bicycle Shifter Brake Color: Black Material: Aluminum Alloy Inner Diameter Bracket Mounting Holes: About 22.2mm Applicable To: MTB, City Car, Recreational Vehicle, Car, FoldingPackage Included: 1 x Bicycle Brake Shifter Or2 x Bicycle Shifter Brakes Note: There can be a small size error for manual measurement. Color deviation may vary due to different monitor settings, please understand.