Single Flute Countersink Cutter

Single flute won't leave wavy chatter marks in the bottom of the countersink like the 3-flute will. Single flute are much more aggressive, do not push on them like the 3-flute! 100 degree single flute. 3/8 body diameter. 1/4-28 thread Use with micro stop units (CT-196, CT-360& CT-365). Notice:  Due to the geometry of  these cutters the pilot is back cut a bit making the pilot weaker (especially the #40).  We find that about 10% of the #40 pilots end up having the pilots break off when used under a side load.  CAT does not warranty for this, use at your own risk.