G-J-Hall-HB40-Micro-Drill-Reamer-G-J-Hall-HB40-Micro-drill-reamer-1-to-5mm-HSS-material-2-flutes-design-piercing-&-opening-out-of-small-holes-in-printed-circuit-board-shim-ideally-suited-to-starting-or-cleaning-an-existing-hole-G-J-Hall-HB40-Micro-Drill-Reamer-1-5mm