Metric drill bit set (ultra cheap)

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I can use the odd diameters.
Seems the case plastic is soft, making reinserting the small bits a chore
(maybe some silicon/Teflon lubricant will help, if it lasts).
The bit holder extender has a much more powerful magnet than other cheapos. Yea!
My grinder and drill sharpener turned the other (wood?) 8 mm bit into an extra bit to be used on aluminum.
Apparently the same cannot be done to the masonry bits since their flutes are dull.
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