Joint design, non-slip and shockproof Break the dimensional constraint, can clip lamp holder, mobile phone holder, code watch, horn, etc. Single and double poles are available, meet to different needs Standard socket head screws, easy to install and disassemble High quality aluminum alloy, durable and colorfast Features: 1. High quality aluminum alloy, durable and colorfast. 2. Break the dimensional constraint, can clip lamp holder, mobile phone holder, code watch, horn, etc. 3. Joint design, non-slip and shockproof. 4. Standard socket head screws, easy to install and disassemble. 6. Colorful, cool and fashionable printing. Specifications: Condition: Brand Item Type: Bicycle Extension Frame Material: Aluminum Alloy Color: black, blue (optional) Tube type: aluminum alloy tube, carbon tube (optional) Tube length: 10cm, 20cm (optional) Frame size extension: approx. 9.5 * 3.8cm/3.7 * 1.5in Aluminum alloy tube size: approx. 10 * 2cm/3.9 * 0.8in Carbon Tube Size: Approx. 20*2cm/7.9*0.8inch Weight: approx. 44 97g/1.6 3.4oz Package List: