Hex Screw & Hex Bolt Material : Stainless Steel/duplex Steel/ Nickel Alloys Grade : A2-50 , A2-70 , A2-80 , A4-50 , A4-70 , A4-80 , 200 Series Standard : Metric - Din 933 , Din 931 , Iso 4014 , Iso 4017 , Is 1363 / 4 Inches - Bs 1083 , Ansi B18.2.1 Size In Dia : Metric - M3 ~ M56 Inches - 3/16" ~ 2" Size In Length: Metric - 6 Mm To 500 Mm Inches - 3/8" To 20" Manufacturing By: Cold Forming Hot Forming