Material: aluminum alloy CNC fixture + aluminum alloy tube Color: black, blue, red. Chuck diameter: 30mm. Extension tube size: about 21mm * 200mm / 0.82 * 7.87in (D * L) Height: 95 mm (3.74 inches) Features: The extension frame is made of high-quality high-strength aluminum alloy, sturdy and durable, light in weight, smooth overall, and corrosion-resistant. Each extension frame has two screws fixed with two clips, and it also has fixing and protection functions. The rubber gasket prevents the handlebar extension from sliding and scratching the handlebar. Ultra-light aluminum alloy material, portable and durable, suitable for most types of bicycle handlebars (please measure the specific space size of the bicycle handlebar before buying). The bicycle extension rack adds extra handlebar space to your bicycle and is used as a fixed bicycle flashlight bracket, speaker, speedometer, GPS device, mobile phone bracket and other equipment, providing more convenience for your hiking and cycling.