Rivet Nut specification:M3 ,M4 ,M5, M6, M8 ,M10 ,M12, inch: 1/ ... , ship, electron and other fittings of industrial products. types: flat head ,countersunk head, round body, hex body, open end, closed end, body with ribben ... ,5/16. material: steel, stainless steel, brass,aluminium. M4-M10 flat head hex Rivet nut