Electrical work is really three drilling jobs in one: running wire through framing, cutting openings in boxes and panels, and anchoring hardware into masonry. The best drill bits for electricians cover all three with bellhanger bits, holesaws and masonry bits rather than forcing one do-everything bit to compromise on each.
What to Look For
Think about reach, hole size and material before you reach for a bit. Fishing cable through a wall means a long, flexible bit that can span several studs or joists in one pass, ideally with a way to pull the wire straight back through. Adding conduit knockouts or opening enclosures calls for a clean, round hole at a set diameter that connectors are made to fit. Mounting boxes and panels on brick or block needs a carbide-tipped masonry bit built for percussion. No single bit does all three well, so a small kit of specialists beats a jack-of-all-trades every time.
The Best Type of Bit
For wire routing, a bellhanger, or installer, bit is purpose-built: long, with a small hole near the tip so you can thread a fish tape or pull cable straight back through the hole you just drilled. Pair it with holesaws for enclosure and panel openings and you have the core of an electrician’s kit.
- Bellhanger bits: long reach through studs, with a wire-pull hole at the tip for fishing cable.
- Holesaws: clean, sized openings for boxes, panels, conduit fittings and recessed cans.
- Masonry bits: carbide-tipped for anchoring boxes and straps into brick, block and concrete.
- Length: extra reach lets you cross multiple bays or a deep wall without stopping.
Sizing Holes for Conduit and Cable
Cutting openings to the correct diameter the first time avoids loose fittings, air gaps and code headaches. Bi-metal holesaws handle wood, drywall and sheet-metal enclosures in one bit, while a careful, steady feed keeps thin panels from grabbing and distorting. Match the saw size to the fitting’s trade size so connectors seat properly and lock down secure, and centre the cut so knockouts line up cleanly with the raceway behind them.
Working Cleanly and Safely
Always confirm a wall, box or panel is de-energised before drilling, and keep a bit long enough to clear obstructions in one pass so you are not forcing a short bit at an angle. A bit that starts straight and cuts true matters most when you are drilling blind through a wall and cannot see the tip emerge. Keep the drill square to the framing and let the bit pull itself in rather than leaning on it, which both protects the bit and gives you a cleaner path for the cable. A slow, controlled speed on holesaws stops the teeth from overheating in sheet metal and leaves a burr-free edge that will not nick insulation. Our American-made bits are ground for exactly that: a clean start, a straight bore, and an edge that lasts across a full rough-in.