We protect our most valuable possessions with an alarm system, here is how to do it for your bike. Hardened 12mm round shackle The shackle, the body and the load-bearing parts of the locking mechanism are manufactured using specially hardened steel Special, modern design of the lock body casing allows for optimum handling High-quality locking cylinder for high protection against manipulation, e.g., picking Alarm at a volume of at least 100 dB for 15 seconds, followed by automatic reactivation 3D Position Detection – detects vibrations and the smallest of movements in all three dimensions and triggers an alarm CR2 batteries included Specifications Bracket: USH Internal Lock Size Metric: 160x85mm Lock Type: Key Primary Color: Black Thickness In mm: 12mm Internal Lock Size Imperial: 6.3"x3.3" Special order - ships in 5-10 days from our distributor.