Rivet Nut specification:M3 ,M4 ,M5, M6, M8 ,M10 ,M12 ... 3/16,5/16. material: steel, stainless steel, Rivet nutwe use cold forged technique, not only save materials ... fittings of industrial products. types: flat head ,countersunk head, round body, hex body, open end, closed end, body with ribben, body with groove and so on ... material: steel, stainless steel, brass,aluminium. M4-M10 flat head hex Rivet nut