250, 000 manufactured key differs: Highest protection against manipulation. Through hardened steel alloy shackle: Resists hacksaw attacks, Hardened steel alloy body: Optimum drill & pull resistance 11mm shackle: CEN grade 4 security, Ball bearing locking: Resists lever & torsion attacks, Open shackle: ideal to be used with chain, Long shackle (HB) versions available: For most security needs, Re keyable version available: Allows additional locks to existing keys, Many more keyed alike suites available: Convenient high security, Outer Measurment: 63 / 85 / 31 (Size mm) Shackle Measurment: 27. 5 / 26 / 11 (Size mm).