... A.Product specifications Camera screws Size Norminal diameter: 1/4",M3-M6 D=2-4mmNorminal thickness:0.5-1mm. ... A286,35#,40CR,35CRMO,SCM435,and etc. 1/4-20 Camera screws Surface treatment Plain, Black Oxide,nickel plated, Chromated, passivated ... Quality control systems Quality Certificate:ISO9001:2008, ISO14001:2004Inspection quality system:ISO standard, 100% Whole range inspection through the production ...