The Attica Chain and Padlock provides the maximum protection for all your lock-up needs. The hexagonal 16mm hardened alloy steel lock shackle had a bump-proof and pick-proof dual-bolt locking mechanism to keep your belongings secure. The Attica comes with a $4,000 theft replacement guarantee and 3 laser-cut keys and a missing key replacement program if your keys are lost or stolen. This lock measures 3" x 12mm.