Where to buy small metric counterbores

Are you aware you can grind any drill bit, including Metric, flat on the tip and use it for counterboring? First, start the hole with a normal drill bit of the size you need, and then finish it with the flat bottom drill.

I learned this when I bought a set of letter drills at a machine shop auction and they were all ground flat on the bottom. Work like a charm for counter boring.

Paul

Without a pilot? It doesn't wander? If not, why not?

Thanks, Bob

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-- Unka George (George McDuffee) .............................. The past is a foreign country; they do things differently there. L. P. Hartley (1895-1972), British author. The Go-Between, Prologue (1953).