There are occasions where it's difficult to debur small drilled holes with the 'normal' small countersinks available; what I have done is to utilise a small 5 mm glass drill. Having a carbide tip these drills, being of narrow profile, has made deburring tiny holes easier, I simply pressed the drill into a small file handle and Voila' a neat small pocket size deburring tool. Having a carbide tip this tool should never wear out, you would only need to dress the two cutting lips with a diamond stone for optimum sharpness.
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