This high security lock features an innovative oval crossbar disc lock, designed to defeat maximum attacks. Features: 12mm six-sided chain links made out of 3t manganese steel 14mm hardened MAX-Performance steel shackle Hardened double deadbolt design provides protection against twist attacks Includes three stainless steel keys: two standard "I" keys and one LED lighted key Security Rating: 9 out of 10 Specifications: Weight: 13.15lbs