Supertough Molybdenum Steel Shackle - Extra protection against hacksaw & cropping attacks. Closed Shackle - Additional shackle protection to resist shackle attack. Hardened Steel Electro-plated Lock Body - Extra strength & resistance against corrosion. Double Bolted Locking Mechanism - Extra strength to resist torsion & pull attacks. Anti Manipulation Locking System - Protects against manipulation attack. 4 Dial Resettable Combination - Resettable combination for added convenience & security. Rust Free Internal Components & Dual Drainage System - Extra resistance against corrosion. 10 year guaranteeBody Width: 62mm. Shackle Diameter: 11mm. Shackle Internal Clearance: 21mm Wide x 30mm High. Kasp Security Rating: 11 (Rating scale 1-15)