I meant to get a countersink for wood. Then in the hardware store, beside the countersinks, I saw a glass/tile drill bit set, which as a pack, is not so much more expensive than a single countersink. So, I got those glass/tile bits.

Now, I have a problem whether these bits would actually last. I suppose these are Tungsten Carbide & perhaps cut more so with it's hardness (chipping at the ceramic or glass) than with a sharp edge. I haven't opened them, but I assume them to be sharp. So if I used these & the sharpness wears away on its intended use, it's still good for the intended use. But, for wood, without the sharp edge obviously, it won't bore well.

Am I wrong here?


A glass or tile drill has a cutting edge designed for that hard material which comes off as a dust.

A wood bit cuts more material faster so it has a fluting designed to remove that material.

Purchase and use the correct one for the job otherwise they can overheat and fail needing replacement.

  • $\begingroup$ Ceramic bits work more by crushing, that is why impact drills are so effective. $\endgroup$ – blacksmith37 Jul 24 '20 at 14:37

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