... .thickness:sch10-sch160 3 standard:ASTM,DIN,JIS,KS,EN,BS ASTM/JIS/KS/EN//DIN ReducerSize: 1/2"-56"Wall thickness ... an area of 15,000 square meters. We are ISO9001, KS, API certified. Our products are sold well in Korea, Japan ... . Any inquiry will be replied within 24 hours. ASTM/JIS/KS/EN//DIN Reducer