Feature:1. High quality aluminum alloy, durable and colorfast.2. Break dimensional constraint, can clip lamp holder, mobile phone holder, code watch, horn, etc.3. Gasket design, anti-slip and anti-shock.4. Standard socket screw, easy to install and disassemble. 5. Single and double poles are available, meet different needs.6. Colorful print, cool and fashionable.Spec:Condition: 100% Brand NewItem Type: Bicycle Extension FrameMaterial: Aluminium alloyColor: Black, Blue (optional)Tube Type: Aluminium alloy tube, Carbon tube (optional)Tube Length: 10cm, 20cm (optional)Extension Frame Size: Approx. 9.5 * 3.8cm / 3.7 * 1.5inAluminium Alloy Tube Size: Approx. 10 * 2cm / 3.9 * 0.8inCarbon Tube Size: Approx. 20 * 2cm / 7.9 * 0.8inWeight: Approx. 44-97g / 1.6-3.4ozPackage list:1 * Extension frame1 * Aluminium alloy tube / 1 * Carbon tube1 * Hexagon screw