Self -Clinching Rivet Nuts:These standoffs, which use the proven self-clinching design, install with a squeeze in punched or drilled round holes and become permanently mounted in the thin sheet.Specification:Size:#8-32Material: Carbon Steel with Zinc PlatingOuter Diameter(Max): 7.87mm/0.31inch;Outer Diameter(Min): 5.38mm/0.21inch;Mounting Hole Diameter: 5.38mm/0.21inch;Length: 3.66mm/0.14inch;Surface treatment: PassivationPackage Content: 50Pcs x Self -Clinching Nuts