rivet material: steel, stainless steel, brass,aluminium. we can produce it according to the customer's drawing. rivetwe use cold forged technique, not ... with ribben, body with groove and so on . also we can produce according to customer's drawing. specification:M3 ,M4 ,M5, M6 ... ,5/16. material: steel, stainless steel, brass,aluminium. pop rivet nut