Trimax MAX90 Ultra-Max Security U-Shackle Lock is designed for securing your bicycle, motorcycle or all-terrain vehicle (ATV). The ultra-max security is delivered by the 13/16 inch (16mm) diameter hardened steel u-shackle and dual shear plate locking mechanism that is nearly impenetrable. MAX90 also features a "Wise" key steel lock cylinder that is drill and pick resistant with three keys. One key has a mini flashlight built into the grip. A mounting bracket is included for storage and accessibility.