The Monarch VMC150 uses a American Standard Steep Machine Taper, No.45
Commonly referred to as ASA 45.
The taper is 3-1/2 inches per foot.
This is more information on the ASA 45
http://wiki.xtronics.com/index.php/TapersScroll down to the heading > Single Flange Tool-Holders in blue.
Regards,
joecoolvette
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