... Passivated stainless steel Camera screw size: 3/8",M3-M6 D=2-4mm,1/4-20x4 Passivated stainless steel 3/8" Camera screws:A.Product specifications ... alloy steel,Japan SUH660,America A286,35#,40CR,35CRMO,SCM435,and etc. 3/8" Camera screws Surface treatment Plain, Black Oxide,nickel ... Dacromet,copper plating, gold plating and etc as per your need. 3/8" Camera screws salt spray time 2 hours, 24 hours, 48 ...