Additional Comments On Jul 25, 2020:They look great. But are too big with a not so sharp, smooth edge for drilling into Diamond cast blanks. Even tried my wood blanks. Turned speed way down to 200 rpm, took very small turns on depth and even predrilled with other bits. Still broke and shattered my new DIAMOND CAST blank and my PurpleHeart. They seem to PUSH through pen blanks instead of cutting through. I'll need to come up with another plan to drill holes in blanks for this bushing set. I have found that "Fuller HSS Brad Point Drill Bit" cuts a lot better, smoother.
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