... steel , stainless steel camera screws size: M3-M6 D=2-4mm camera screw head shape:with a D ring camera tripod screws :A. ... Product specifications Camera Screws Size Norminal diameter ... SUH660,America A286,35#,40CR,35CRMO,SCM435,Brass,and etc. Camera ScrewSurface treatment Plain, Black Oxide,nickel plated, Chromated, passivated, ...