3/4" body 100° micro stop countersink, 3/8-24 thread.
A micro stop countersink screws into a micro stop cage, which sets the depth mechanically so every seat comes out the same — the standard way of countersinking for flush fasteners in aerospace work. The cutting body is 3/4" at a 100° included angle, on a 3/8-24 mounting thread.
It takes pilot pins from .2500 to .2570", so one cutter covers a range of hole sizes: change the pilot, not the tool.
Available in 2, 3 or 4 flutes and other pilot ranges on request.