Standard: ASTM A53, BS1387Size area: Nominal bore: Light: 15 - 100mm Medium: 20 - 130mmHeavy: 15 - 150mmOutside diameter: Light: 21 - 113.9mm Medium: 26.6 - 166.1mmHeavy: 21.1 - 166.1mmThickness: Light: 2 - 3.6mm Medium: 1.56 - 19.7mmHeavy: 1.44 - 21.3mmWeight: Light: Plain ended: 1 - 10.03kg/mScrewed and socketed: 1.007 - 10.28kg/mMedium: Plain ended: 1.62 - 20.1kg/m Screwed and socketed: 1.64 - 20.71kg/mHeavy: Plain ended: 1.49 - 21.68kg/m Screwed and socketed: 1.5 - 22.22kg/m producing area:China