Should fit any of the 16 inch monarchs possibly other sizes look at pics and ask questions. The item "40's monarch lathe boring bar holder" is in sale since Thursday, November 8, 2018. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\CNC & Metalworking Supplies\Equipment Specific Tooling\Lathe". The seller is "zcar74350" and is located in Moscow, Idaho.