Are you looking for a professional, yet affordable bike heightening device? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? If yes, look no further Our professional bike heightening device must meet you needs. It is one of the best choices for you. Features - Color: Silver. - Size: 12 x 3.5 x 3.5 cm. - Material: Aluminum alloy. - The material of the product is finished by the aluminum alloy turning process, which makes it have better strength. - Sturdy, corrosion-resistant, rust-free, high toughness, no deformation. - The height of the extender can be adjusted by adjusting the number and type of spacers, reducing the pressure of waist effectively, biking more relaxed. Take the discomfort away from your upper back, neck and wrist. - More resistant to oxidation and corrosion, not easy to loose, and safer to use. - Light weight, adjustable height, ultra high strength, easy to install - Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand