The wrong bit burns, wanders or snaps. Match the bit to the material.
- Wood: brad-point bits for clean holes, spade bits for fast big holes, and a countersink for flush screws.
- Metal: HSS or cobalt twist bits. Go slow and use cutting oil.
- Masonry: carbide-tipped bits in hammer mode.
- Tile and glass: diamond or carbide spear bits, kept cool and with no hammer action.
- Large holes: bi-metal hole saws with an arbor for wood, drywall and thin metal. Use an electrician's size range for boxes and conduit.
Tips
Start with a pilot hole, keep the bit square, and let the tool do the work.
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