ITEM NAME:SD-689 Multifunction Bike Handlebar Extension Bicycle Computer Bell Bracket #gib Product Description Description: SD-689 Multifunction Bike Handlebar Extension Bicycle Computer Bell Bracket Lamp Extender Mount Holder Specifications: Model: SD-689 Material: PC+TPU Installation diameter: 31.8mm/1.25'' Color: Black Size: 106mm*67mm*44mm/4.17*2.63*1.73'' Net weight: 35g Gross weight: 42g Install method: 1. Use a hex wrench to remove the screw. 2. Place the bracket on the handlebar, adjust the position and tighten the screws. 3. Attach the stop base to the bracket. 4. Finally install the code table. Notes: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item.Thanks for your understanding. Included: 1 x Code Table Extension Bracket 1 x Hex Wrench.Place the bracket on the handlebar, adjust the position and tighten the screws. Included: 1 x Code Table Extension Bracket. Attach the stop base to the bracket. Size: 106mm 67mm 44mm/4.17 2.63 1.73".