... clinching standoffs Detail Information About the standoffsMaterialCarbon steel, alloy steel, stainless steel, spring steel or as you requestThread M3, 3. ... 5M3, M4, M5 Length6~25mm, .312~1.062" Finish zinc, ... done, thank you!! Certifications show: China zinc plated steel/ stainless steel self clinching standoff fasteners,hex rivet nut