What Are Drill Bits Used For? Drill bits are primarily used for creating circular holes in materials from drywall and wood to metal and masonry. They might create a hole for an anchor or fastener, or a passage to feed wiring. Bits are sold individually and in multi-sized sets, commonly called drill indexes.
Size 2mm,3mm,3.5mm,4mm,4.5mm,5mm,6mm 8mm,10mm.