Bicycle Brake Levers Shifter 3×7 21 Speed Shifter Bicycle Shifter with Gear Indicator,Cable Thumb Gear Shifter EF51 Speed Shift Derailleur Lever Transmission

About this item 21speed: 3 speed left, 7 speed right. For V-brake: Compatible with V-brake system. For 22.2mm Handlebar: Suit for 22.2mm/0.87in diameter handlebar. Separate System: Combination of the separate brake lever and gear shift systems. Package Included: left & right shifter, stainless steel inner cables, The front gear position display allows you to view the gears clearly and quickly.