Kryptonite's Evolution Series 4 1090 Integrated Chain is a 10mm-thick, six-sided link chain made of triple-heat-treated manganese steel for maximum strength that carries a Kryptonite security rating of 8/10. 

FEATURES:

• 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

SPECS:

• Product dimensions: 35.5” (90cm) chain length
• Product weight: 6.10 lbs (2.77 kgs)