Its clear visible gear display design makes you to see at a glance. It has a simple installation, and once installed correctly, it can work normally. Made of aluminum alloy, it is light in weight, integrated in design, and easy to control. The length of the product is 19.6cm, the width is 15cm, and the height is 6cm. It is perfectly suitable for mountain bike, and this is a unilateral left and right trigger shifter, that is, the 3-speed is the left gear shifter, the 7-speed is the right gear shifter, the 8-speed is the right gear shifter, and the 9-speed is the right gear shifter. Item Name: Trigger Shifter Material: Aluminum Alloy Size Details: Size: 19.6cm x 15cm x 6cm/7.72" x 5.91" x 2.36" (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 Trigger Shifter