OnGuard Beast Chain (7'/12mm) BEAST SERIES | Ultimate protection for high crime areas. OnGuard chain locks offer bicycle owners and powersport enthusiasts extra length for locking versatility plus the highest level of security for use in high crime areas. Massive, titanium-reinforced hexagonal links render hacksaws and bolt cutters virtually useless, while tight inside link dimensions make prying impossible. Available in a wide variety of chain lengths and link sizes to match your security needs. Hexagonal and square links present more hardened surfaces than round links making sawing and cutting virtually impossible.