- Double Bolt Locking Mechanism provides added strength by locking the crossbar to the shackle on two sides- Features 13mm ultra hardened steel shackles for maximun cut resistance- Dust covers and vinyl coating protects the crossbar, shackle and cylinder from damage- Includes multi-size/multi-position mounting bracket, (5) keys (1 with micro-light and 4 regular keys), plus OnGuard's anti-theft protection plan- LS: long shackle model for added convenience - ATB: slightly wider shackle to fit around extra-fat tires- STD: sized to fit most any bike on the market- LM: Lean and Mean is the lightest full size U-lock on the market- DT: includes four foot cable with lock loops on each end- Combo: features user resettable 4-digit combination- Mini: short shackle model fits in a back pocket