The Omnigrid 1" x 12" ruler is used with compass points to draw circles (it has an extra ½" to accommodate compass points); it's also used to add seam allowances when sewing and quilting.
Use with a rotary cutter or a straight-edge blade
The 1" x 12" ruler has the following standard Omnigrid features:
Edge markings for accurate measuring
Laser cut edges for smooth, deep cutting
Patented double-sight lines that show up on light and dark fabrics
Heavy-duty durable acrylic material
Left- and right-hand use