I actually thought it was for something different
Figured out how to make it work
MSQC SKU: NOT4668
MFG SKU: R4C12
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Omnigrid OmniArc Circle Cutter
This non-slip acrylic ruler has handy grooves for the rotary cutter blade and easy-to-read angle markings for cutting circles with a finished diameter of 4", 6", 8", 10" or 12". Includes double-sight lines that show up on light and dark fabrics.