All SerfasA(R) locks come with our Limited Lifetime Warranty to ensure your product is free of manufacturing and/or material defects. Features: Unique Combination U-Lock 4-Digit Resettable Combo Lock Hardened Steel Shackle Rubber Coated Specs: Shackle Length: 165mm (6.5 inches) Shackle Diameter: 12mm (0.47 inches) Weight: 816 Grams (1.8 lbs) Security Rating: 5/10