Shockproof M540mm Titanium Alloy Bicycle Seatpost Fixed Bolt Round Head Screw MTB Road Bicycle Accessory Features: 100% brand new and high quality. Made of premium titanium alloy, anti-corrosion, strong and durable. CNC precision processing, accurate and standard size. Precision threads, firm connection, not easy to fall off. Great DIY replacement parts for bike. Specification: Color: black, gold, titanium color, colorful Material: titanium alloy Size: M540 Weight: Approx. 7g Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Includes: 1 Seatpost Fixed Bolt