Made of high quality titanium alloy material, waterproof, anti rust, anti corrosion, long service life. Rear derailleur guide wheel screws has high strength, great durability, light weight, and reliable erformance. Specification M5 * 14.2mm, 2 pieces in total. Simple but elegant design, suitable for most road bikes and mountain bikes. It is easy to install and disassemble. It is a good modified accessory to cycling lover. It also can reduce installation time for you. Product Material Titanium Alloy Colour Black Size M5x14.2mm Part Type Rear Derailleur Screw Type Rear Derailleur Screw Brand Unbranded/Generic MPN W2D94927341911 EAN 4894927341911 .