Type of Link ..: Chain Link Mechanism ..: Double Lock Manufacturation ..: Riveted Key ..: Pin Material ..: DD11 Weight ..: 540 gms / 19 oz Lenght ..: 670 mm / 26.1 in Minumum opening ..: 70 mm / 2.76 in Minumum inside perimeter ..: 213 mm / 8.39 in Maximum inside perimeter ..: 285 mm / 11.23 in Locking positions ..: 18 Finished ..: Nickel - Black Oxid