... :Stainless Steel Specification:M6,M8,M10 Rivet nut (falt head,round body)we use cold forged technique, not only save materials,good ... products. types: flat head ,countersunk head, round body, hex body, open end, closed end, body with ribben, body with groove and so on . also we ... ,5/16. material: steel, stainless steel, brass,aluminium. stainless steel round rivet nut