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last Saturday I needed a 9/16" steel twist bit....
found a made in China for 22$ at Ace hardware...
no American made ones to be had....
the third hole chipped (took chunks out of) both cutting edges...
Ace warrantied the bit...
while trying to finishing the third hole the bit split length wise... (stamped bit???)...
Ace warrantied that one and then told me there was no point in taking a third one...

caught up to my supplier today...
Silver and Deming  M7 reduced shank made in USA drill bit...
cost all of $11.50..... plus tax....
and it finished the third hole along with the remaining 17 and seemed no worse for the wear...

I did use my drill press...
I did use cutting oil...
and it was 3/8" brass plate I was trying to drill...

chinese and cheap...
but not inexpensive...

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  • 2 weeks later...

We buy a lot of tooling from European Tooling Systems. They have an on-line catalog. They stock metric bits in several variations. Carbide tipped or solid carbide, thru bore or dowel bit (brad point), several shank types. The bits we use have 10mm shanks to fit the boring block on the router or bore & insert machine. 

For good twist drills try MSC, they have a huge selection, online catalog and very fast delivery. And as usual, do a Google search. 

For my own general purpose use I've got a set of screw machine bits of M2 alloy, very hard but brittle.

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  • 4 weeks later...

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