High quality - heavy duty aluminum compared to carbon fiber rods. Super light material, portable and durable, stable, anti-rust. And the racks are well constructed and sturdy. Incredibly More Space - The super longer / elongated tube can assemble more items such as lights, bike computers, phones, GPS, bell holders, clip lamp frames, bike stands, cell phone, code tables, horns, etc. Fits Most Bikes - The bike extension mount fits most bicycle handlebars. Fits most bicycles. Suitable for 21mm handlebars (add large gasket) and 32mm handlebars (add small gasket) (please check the size carefully before purchasing). Easy Installation - Thick Rubber Bands Seals inside the ring that attach to your bars for a strong and secure grip effectively prevent the handlebar extension from slipping. With an Allen key, you can easily install and remove the extension bracket within a minute. Safe and Stable - Don't worry about the angle being tipped, damaged or crawled on a bumpy road as soon as it is secured to the stem with our specially designed screws. Much more stable and non-slip than other bicycle extensions with clamps.