Applicable bicycle models: Trek 8.6 Elite 820 820 WSD 830 8300 8500 910 920 930. This bicycle handlebar extension mount supports handlebar diameters from 22.2 mm to 31.8 mm. It comes with adjustable rubber gaskets to ensure a firm and stable fit during installation. Please measure your handlebar diameter accurately before placing an to avoid mismatches. materials: This bicycle handlebar extension is made of aluminum alloy, which is lightweight and durable. The surface is treated with anti corrosion, effectively preventing rust and fade, and ensuring that it remains bright as after long term outdoor use. There is no extra weight, which is an ideal choice for riders who pursue quality and durability. Wide application: This bicycle handlebar extension enhances your bike's adaptability by providing additional mounting points for a variety of devices. Whether you want to install bike lights, a smartphone holder, an action camera or other accessories, this bike handlebar extender keeps everything organised and within easy reach, making your cycling experience smoother and more enjoyable. Easy to install: This bicycle handlebar extension mount is designed with user convenience in mind. It comes complete with a hex wrench for quick and hassle installation. Simply align the extender on your handlebar, tighten the dual clamps securely, and you're ready to go. No specialised tools or complicated steps are required, making this bike handlebar extender ideal for riders seeking a straightforward upgrade.