1.Mateial: Carbon Steel , stainless steel ,Alumi-num,etc 2.Finish:zinc/nickel plated 3.RoHS-approved 4.Package:poly bag industrial use hex head Pressure riveting ... zinc,blue zinc,yellow zinc,black zinc,chorme plated,nickel plated,black oxide4.Thread sizes: all kinds of British System, American system, metric thread etc.5.Standard: standard ...