Kryptonite Evolution Series 4 21"

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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 keys one LED lighted key with replaceable battery and 2 new, ergonomic I keys
Durable weather-resistant nylon sleeve prevents scratches
Key Safe Program