Kasp K17580D - High Security Armoured Shutter Lock Hardened Steel Shackle - Extra protection against hacksaw & cropping attacks Double Ball Bearing Locking Mechanism - Extra strength to resist torsion & pull attacks Solid Brass Body encased in a Steel Jacket - Extra strength & resistance against corrosion 5 pin cylinder with anti-pick mushroom pins - Extra protection against picking Paracentric keyway - Extra protection against manipulation Drill resistant keyway - Protects the cylinder against drill attack Body Width: 80mm Shackle Diameter: 12mm Shackle Internal Clearance: 37mm Wide x 17mm High Kasp Security Rating: 11 (Rating scale 1-15) Comes with a 10 Year Manufacturers Warranty