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 Security rating 8/10 Weight 4.4 kg Dimensions Length: 160cm