R-TECH Hex Socket Countersunk Screws A2 ST/ST Range - R-TECH 337509, The R-TECH 337509 is a reliable M5 x 12 hex socket countersunk screw constructed from A2 stainless steel, designed for applications needing a flush finish and superior corrosion resistance. R-TECH 337509 M5 X 12 Hex Socket Countersunk Screws A2 ST/ST - Pack Of 100