Function: 1. Aluminum alloy: This pair of bike V brake extension converter set is made of durable aluminum alloy, which is corrosion resistant and oxidation resistant, which is more durable and strong. 2. Application: Aluminum alloy bicycle V brake extension base suitable for bicycle frame or front fork, the mounting opening of the base is 10mm, the extension distance is 22mm. 3.Easy to use: The bicycle wheel V brake extension set with small and lightweight design is easy to carry and use, easy to install and disassemble, save time and effort. 4. Polishing and Strengthening: Adopts excellent manufacturing process, fine polishing surface to ensure strength and increase tightening reliability. 5. Bike Replacement Parts: This 406 to 451 converter seat adapter set is a practical bicycle replacement and repair parts for outdoor cycling and riding. Specifications: Item Type: Bike V Brake Extension Set Product Material: Aluminum Alloy Total Weight: 58g / 2.0oz Product Color: Colorful Size: Extension Seat: Width: 9mm / 0.4in Height: 42mm / 1.7in Length: 25mm / 1.0in Mounting Diameter: 10mm / 0.4in Extension Distance: 22mm .9in Brake Column: 34in mm/1.4mm In screw: 17.5x13.8cm / 0.7x0.5in Product Application: Bike Frame or Front Fork Package List: 2 x V Brake Extension 2 x Brake Column