Hardened passivated steel chain Ø 13.5 mm Protective sheath in black braided nylon| Locking block in HR stainless steel Double locking mechanism in hardened steel High-security cylinder with 7 discs Anti-sawing, anti-picking 2 M10 stainless steel dowels for high-security anchoring| Supplied with 3 milled keys Exclusive code key copy service|