Type: Helmet lock Color: Black Comprises locking bar unit that clamps onto round tubing,Anti-theft bolts such as handlebars Easy to install,no instruction. Package Include: 1* Helmet lock 2* Keys 2* screw

Note: Transition: 1cm=10mm=0.39inch Please allow 1-3mm 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!