- Joined
- Feb 17, 2013
- Messages
- 4,417
I just recently bought a bunch of annular cutters. All of them have 3/4" shanks with two flats 90º from each other. Both cutters in @Jackle1312's photo seem to have a third (Weldon?) flat halfway between the usual flats. Those flats also have what look like setscrew dimples added. The 1/2" diameter cutter does look a bit odd, because the business end is narrower than the shank. Notice that the 20mm cutter is equipped with a slug ejector pin.