13mm hardened Performance steel shackle resists leverage attacks and bolt cuttersHigh-security Bent Foot design for serious protectionFeature a patented deadbolt locking mechanism, pickand drill-resistant disc-style cylinder and enhanced internal engineering to resist twisting and leverage attacksOffset key location and overhead cam locking mechanism resist attacksRotating dust cover protects and extends the life of the cylinderInclude two stainless steel I keys for easier operation.