... .FinishPlain;black; zinc plated(Cr,3+);zinc plated(Cr,6+); hot dipped galvanized; dacromet;nickle plated;cadmium plated,etc.6.SizeM3 ... UNCGrade: 4 Material: Mild Steel ( SAE 1008, LY, Q195, ML08 )Hot forged, sizes: M20-M56; 3/4"- 2-1/4”Grade:4 ... to 3000mm)Grade 4.8 6) Processes: Cold forging and Hot forming, with or without heat treatment7) Finish Treatment: Plain, Black ...