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it's a boring head... that can cut tapers? I didn't know these existed
quick look online on PM and elsewhere suggests that they're rare and incredibly complicated, which seems believable
looks like it's got the S20x2 buttress thread on a morse taper 4 shank, with what looks like a ISO40 to MK4 adapter in the box, so good for about any deckel mill and not so good for anything else