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Flat wood bits, also called spade bits, are a quick, inexpensive way to bore utility holes through studs for cable, pipe and other services. They cut faster than many general-purpose bits, but they are not the cleanest or easiest to control. The right choice depends on hole size, how many holes you need, and whether you can reach the framing straight on.
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Choose the right bit for the hole
For occasional holes around 1/2 to 1 inch, a basic spade bit is usually enough. Look for a sharp center point and cutting spurs at the outer corners; the point helps keep the bit on layout, while the spurs score the hole edge before the flat cutters remove wood. A cheap bit is fine for a few holes in ordinary, dry framing lumber. It may cut more roughly or dull sooner, but replacing it costs little.
For repeated holes, larger diameters or awkward access, spend more on a bit with a threaded feed point, a hex shank that grips securely, or a design made to reduce snagging. A threaded point can pull the bit into the wood with little pushing, which is useful overhead or when drilling multiple holes. That same self-feeding action can grab aggressively, though: keep a firm two-handed grip and avoid using it where a sudden pull could make the drill twist out of your hands.
Compare basic spade bit sets if you need several common diameters. For a single job, buying one correctly sized bit is often cheaper than paying for sizes you will not use.
Spade bits and alternatives
| Bit type | Best use | Trade-off |
|---|---|---|
| Basic spade bit | A few utility holes in studs | Fast and inexpensive, but can tear the exit face |
| Self-feeding spade bit | Repeated holes or drilling where extra feed help matters | Pulls strongly; demands a controlled grip |
| Auger bit | Deep holes and steady progress through framing | Usually longer and more expensive; can still bind |
| Hole saw | Large, relatively clean openings | Slower through thick framing and removes a core of wood |
A spade bit is a practical choice for rough utility holes, not finish work. If the hole will remain visible or needs a clean edge on both faces, consider a hole saw or another option suited to the finish. For frequent drilling in studs, wood auger bits may be worth the extra cost, especially when their longer reach is useful.
Size and placement matter more than speed
Choose the hole diameter to suit the service, not just the bit already in your toolbox. Allow enough clearance to pull cable without scraping it against the wood, but do not make a larger hole than the job requires. Check local code and the project requirements before drilling: rules for cable holes, edge distances, notching and boring vary by application and jurisdiction.
Studs are commonly 1 1/2 inches thick, so a standard spade bit can reach through the framing in one pass when you have straight access. Before drilling, locate wiring, plumbing and other obstructions with appropriate checks; a stud finder alone may not identify everything in the wall. Mark the center carefully and keep holes centered in the stud when possible. Drilling too close to a face can leave too little wood protecting a cable or pipe from fasteners. Where required, fit a nail plate over the vulnerable area.
Drill steadily and control the breakout
Use a drill with a side handle for larger bits or any situation where the bit could bind. Set the clutch aside for drilling, select low gear if the drill has a two-speed gearbox, and use a firm grip. High speed may feel faster in soft wood, but it can make a large bit harder to control and increase heat. Let the cutting edges work; forcing the drill can overheat the bit, burn the hole or cause a sudden stall.
To reduce splintering at the back face, stop when the center point just starts to emerge, then finish from the opposite side using that point as a guide. If you cannot reach both sides, clamp a scrap block tightly against the exit face where practical. Expect more tear-out when drilling through knotty, wet or splinter-prone lumber. Clear chips from the hole if the bit starts cutting slowly, and back the bit out periodically on deeper or obstructed cuts.
Match the shank to your drill
Check the bit shank before buying. A round shank fits a keyed or keyless chuck, but can slip if the chuck is worn or not tightened firmly. A hex shank can resist slipping in a compatible chuck and is convenient for quick changes, though it does not make a bit immune to binding. Confirm the shank fits your drill’s chuck, especially with larger bits.
Do not assume an impact driver is the best tool just because a bit has a hex shank. Spade bits are generally intended for a drill, where you can control speed and hold the tool against torque. If using an impact-rated bit, follow its maker’s instructions and keep the drill or driver under control; a large hole can still wrench the tool when the cutters catch. For occasional small holes, a standard cordless drill with a sound chuck is usually the sensible choice.
A practical buying checklist
For one or two ordinary holes, buy a sharp, correctly sized basic bit and use a steady technique. For a run of holes, choose a more durable set or a self-feeding design if you are comfortable handling its pull. If the job calls for a very large opening, a cleaner finish or consistent daily use, compare other bit types instead of forcing a spade bit to do everything.
After drilling, inspect the hole for splintering, scorching and damage to the stud. Replace a bit that has chipped cutters or a bent shank; sharpening a low-cost bit may not be worth the time. A sharp bit, a centered layout and a drill you can control matter more than buying the most expensive set.