As an expert in the industry, trust in the security of the Kryptonite Evolution 1016. With a 10mm manganese steel chain and reinforced oval crossbar lock head, this high security disc-style cylinder offers pick and drill resistance. The weather-resistant nylon sleeve and Key Safe Program further increase protection for your valuable possessions. 10mm six-sided chain links made from manganese steelDesign secures chain DIRECTLY TO HARDENED DEADBOLT, offering no “weak” link in the chain due to the extensive holding power of the link itself against attacksHigh security disc-style cylinder is pick and drill resistantReinforced oval crossbar lock headSliding dustcover protects and extends cylinder life3 stainless steel keys -- one LED lighted key with replaceable battery and 2 new, ergonomic "I" keysDurable weather-resistant nylon sleeve prevents scratchesKey Safe ProgramProduct dimensions: 5.25’ (160cm) chain length. Product weight: 9.70 lbs. (4.40 kgs)Security Rating: 8/10US$3000 ATP