Alpha 3.3-10.2mm M4-M12 Onsite Plus Step Tip Drill Bit 9STM4-M12DSD Digital Multimeter or sanding small parts

or sanding small parts

glass beads can be your best option

It simply screws out leaving an empty hole with no protruding metal parts to grind off

1/4" Anvil

Alpha 3.3-10.2mm M4-M12 Onsite Plus Step Tip Drill Bit 9STM4-M12DSD Digital Multimeter or sanding small partsFeatures 10mm Cutting Depth Patented step tip design eliminates pre drilling AlCrN coated for extreme temperature resistance & long service life 4 High performance cutting edges help drill 6x faster 3 Flat shank prevents spinning & ensures optimal power transmission 6 Steps: 3. 3, 4. 2, 5. 0, 6. 8, 8. 5 & 10. 2mm Yep, you read that right. Its a Step. Tip. Step. Cutter. But the name is just the beginning its performance is where the magic happens. The