M3 Button Head Socket Screws,Stainless Steel,Full Thread,Metric,100 Piece (M3 x 16 mm) Thread Diameter 3 mm,Thread Pitch 0.5 mm, M3 Button Head Socket Cap Screws,Full Thread,Metric Drive system: Internal Hex (ALLEN Wrench) Stainless Steel 304 Standard metric threads,From M3 x 4 mm To M3 x 30 mm