• 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.