Cylindrical center for the mill mostly. Just a bit of 1018. Easy to make on the lathe by turning on centers. Fits in places that you could not place a conventional square and while it is not the optimum length for checking lathe alignment it works for a quick check.
Oops. More accurately called a Cylindrical Square.
Last edited by jjr2001; 09-30-2016 at 02:38 PM. Reason: Corrected identification of the tool
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