This insert is a CINCH.
The CINCH carbide insert chamfering tool uses a square
ANSI-standard insert and is available in 60[degrees], 82[degrees],
90[degrees] and 120[degrees] included angles. The design lets users
chamfer holes as small as 7/32". It is available in a Double Angle
configuration which can be used to chamfer both the top and the bottom
of holes as small as 21/32". All of the tools use the same SDEB insert. Each tool comes on a 5/8"-diameter hardened and ground
alloy shank and an extra insert screw. Fitz-Rite Products, Inc., Booth