1) Concentric Reducer 2) Size:1/2"-24" 3) Standard:ANSI, DIN, JIS, BS etc 4) Certificate:ISO9001-2000 MaterialCarbon Steel like A234 WPB, 20G, A105, Q235A/B and steel like ASTM A420 WPL6, ASTM A234 WP5, WP11, WP12 Executive StandardASME B 16.9, GB/T 12459, DIN, JIS, BS etc SIZE1/2"-24" Wall ThicknessSCH10~SCH160, STD, XS, XXS TypeSeamless ConnectionButt Welding Surface Treatmentgrit blasting, ...