Single Types: IS and IC Double Type: ID Triple Type: IT Quadruple Type: IQ Oblong Master Link, Inches (dimensions are approximate)ChainSize Nominal SizeMaterial InsideWidth InsideLength Working LoadLimit(lbs)932 12 2 - 12 5 3, 50038 34 3 6 7, 10012 1 4 8 12, 00058 1 4 8 18, 10034 1 - 14 5 10 28, 30078 1 - 12 6 12 34, 2001 1 - 34 6 12 47, 7001 - 14 2 7 14 72, 300 To prevent the possibility of serious bodily injury: Do not exceed the working load limit for chain or components.Do not use if the chain or components are visibly distorted or worn.