Description: 【Durable Material】Crankset Screw is made of high quality titanium alloy , lightweight, high strength, durable, and sturdy. 【Fine Workmanship】Standard precise threaded size, will not cause different thread thickness, excellent replacement part. 【Function】This crank bolt is to fix the crank, thereby prolonging crank service life and improving riding efficiency and comfort. 【Easy to install】This crank screw installation process is simple and does not require professional tools and techniques, and easy to remove and use. 【Applications】This bike crankset bolt is suitable for mountain bikes, road bikes, folding bikes, etc. It is a great accessory for riding enthusiasts. Specification: Material: titanium alloy Please note when installing and disassembling:The External screw cover has reverse threads, clockwise is loose, counterclockwise is tight. The internal screw is a forward thread, clockwise is tightening Size Chart: Optional: Internal screw: M18mm External screw cover: M30mm Package Includes: 1 Crankset Screw Note: Please allow slightly errors due to manual measurement and different monitors.