This chain lock is ideal for extreme security needs in high crime areas. Features: 14mm six-sided chain links made of 3t manganese steel 15mm 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 Specifications: Weight: 15.25lbs Diameter: 14mm Length: 150cm