Material : Stainless Steel / Duplex Steel / Nickel Alloys Grade : A2-70 , A2-80 , A4-70 , A4-80 , 200 Series Standard : Metric - Din 934 , Iso 4032 , Is 1363 , Is 1364 Inches - Bs 1083 , Ansi B18.2.2 Size In Dia: Metric - M2 ~ M100 Inches - 1/8" ~ 4" Manufacturing By: Cold Forming Hot Forming