This 1/2 x 9 inch seam marking tool is long enough to mark the diagonal of a 6-1/2 inch square Mark through the slotted center with any mechanical
Creative Grids 9in Seam Guide Tool - CGRSMN9
Seam Guide Tutorial: how to sew a straight line and keep seam allowances equal
Creative Grids Seam Guide Tool : Sewing Parts Online
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