Matt, Here's the full text of what's on the single flute deburring bit:
3/8 x 100 CR
There is a degree symbol after the "100" (but I can't figure out how to enter the degree symbol here).
Just for comparison with the other 3/8 (" diameter) x 100 (degree) counter sink bits I have, here is a photo:
The single flute bit may have started out using the same blank as the piloted bits, or the 3 flute pilot-less bit (far right)....it does not look like it was made from another existing bit.
I found the 3 flute deburring bit to be ok for the job, but it requires a bit of care in using it. 3 flutes cut 3 times as fast. Sometimes when trying to remove one small burr from one tangent point of the hole, the other 2 flutes that don't have a burr to cut into are busy countersinking away.....when you really don't want that to happen.
The single flute bit also has a less aggressive cutting angle on the cutting edge that I found works better on removing aluminum burrs. Also, the 1/4-28 threads fit into my go to deburring tool.....one of these:
https://www.aircraftspruce.com/catalog/topages/speeddeb.php?clickkey=11333
As for the single flute tool in Cleveland's current catalog (
https://www.cleavelandtool.com/collections/drilling-and-deburring/products/3-hex-deburring-tool), it has a hex shank presumably for chucking in a drill. Power deburring....with a drill......
Probably does work for some...but too easy to have an "Oh, cr*p" moment from my experience.
Possible solution if we can't locate a source for these: Anybody have a tool re-sharpening setup that can re-grind the front face and put a new cutting edge on this bit? Remember, it is a 100 degree included angle......and most drill bits are 118 or 135 degrees.