10mm six-sided chain links made from 3t manganese steel Patent-pending end link design secures chain to hardened deadbolt eliminating critical vulnerability High security disc-style cylinder is pick and drill resistant Patented*, reinforced oval crossbar lock head Sliding dustcover protects and extends cylinder life 3 stainless steel keysone led lighted key with replaceable battery and 2 new, ergonomicIkeys Durable weather-resistant nylon sleeve prevents scratches Key safe program Patent D564339 (other patents pending) Product dimensions: 35.5(90cm) chain length Product weight: 6.10 lbs (2.77 kgs)