7mm four-sided chain links made from 3t manganese steelPatent-pending end link design secures chain to hardened deadbolt eliminating critical vulnerabilityHardened deadbolt design provides extra holding powerHigh security disc-style cylinder is pick and drill resistantDurable weather-resistant nylon sleeve prevents scratches7mm4`/121.92cmKeyBlk5 of 10UPC/EAN/GTIN: 720018001706