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Best Drill Bits for Wire Holes: Wood, Studs & Metal

What is the best drill bit for wire holes?

The best drill bit for wire holes depends on what you’re drilling through and how clean you need the opening to be. For most everyday routing—running a cable through wood studs, shelves, or cabinetry—a brad-point bit is usually the top pick because it starts accurately, resists wandering, and leaves a neat, round hole that’s less likely to splinter.

Best all-around choice for wood: Brad-point bits

Brad-point bits have a sharp center spur that pins the bit in place right at the mark, plus outer spurs that score the circumference before the cutters remove material. That combination is ideal when you want a clean entry/exit for low-voltage wiring, speaker wire, or power cords passing through furniture panels. They’re especially helpful when drilling near an edge where a standard twist bit can skate.

When speed matters: Spade bits (with a few caveats)

If you’re drilling lots of pass-through holes in framing lumber, spade bits are fast and inexpensive. The tradeoff is a rougher hole and more tear-out, particularly on the exit side. If appearance matters, clamp a scrap board behind the workpiece, drill halfway from each side, or switch to a cleaner-cutting bit style.

For big wire bundles: Auger bits

Auger bits are great for deep, consistent holes in studs and joists, pulling themselves through wood with less effort. They’re commonly used in electrical rough-in work where you’re drilling multiple studs for runs. Choose the diameter with adequate clearance so cables don’t bind or get damaged during pulling.

For metal or plastic boxes: Cobalt/titanium twist bits or step bits

For sheet metal, electrical enclosures, or plastic junction boxes, a step bit creates smooth, controlled enlargements and reduces grabbing. For thicker metal, a quality cobalt twist bit holds up better to heat. Use cutting oil on metal and run the drill at a slower speed for cleaner results.

For a deeper breakdown by material and project type, see the main guide here: https://topbargainsworld.shop/what-is-the-best-drill-bit-for-wire-holes/.

FAQ

What size hole should I drill for running electrical wire?

Drill a hole large enough for the cable to pass freely without force—typically slightly larger than the cable’s outer diameter. Avoid oversized holes that reduce wood strength, and follow any local code requirements for drilling through studs and joists.