Description: The 24-speed gearboxes and the trigger handle of the thumb shifter are ergonomically designed to make the ride easy and comfortable. The thumb shifter makes the gear display a wider field of view, and you can see the speed changes. The thumb shifter is made of high quality aluminum alloy material, which ia durable and long service life. The length of thumb shifter is 17.5cm, the width of thumb shifter is 8cm and the height of thumb shifter is 3.5cm. It is suitable for front 3 gears, rear 8 flywheels and 24-speed positioning transmission system, and it is suitable for handles with a diameter range of 2.1cm - 2.3cm. Item Name: EF51-8 Thumb Shifter Material: Aluminum Alloy Features: Ergonomic, Trigger Handle, Durable Size Details: 17.5cm x 8cm x 3.5cm/6.89" x 3.15" x 1.38" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Thumb Shifter (Brake Cable Included) The 24-speed gearboxes and the trigger handle of the thumb shifter are ergonomically designed to make the ride easy and comfortable. The thumb shifter makes the gear display a wider field of view, and you can see the speed changes. The thumb shifter is made of high quality aluminum alloy material, which ia durable and long service life. The length of thumb shifter is 17.5cm, the width of thumb shifter is 8cm and the height of thumb shifter is 3.5cm. It is suitable for front 3 gears, rear 8 flywheels and 24-speed positioning transmission system, and it is suitable for handles with a diameter range of 2.1cm - 2.3cm.