Ruler 8 1/2 Inch x 8 1/2 Inch Omnigrip

The Omnigrip 8-1/2 square has a diagonal line for triangle cuts; the ruler has extra ½Â on two sides for seam allowance.
In general, Omnigrip square rulers are used for secondary cutting of strips, and to square up finished quilt blocks
Use for quilting, sewing and crafts - or any DIY project that calls for cut fabric
Use with a rotary cutter or a straight-edge blade
The 8-1/2 square ruler has the following standard Omnigrid / Omnigrip features:
Patented non-slip backing to hold fabric in place during cutting
Edge markings for accurate measuring
Laser cut edges for smooth, deep cutting
Patented double-sight lines that show up on light and dark fabrics
Diagonal line for triangle cuts
Heavy-duty durable acrylic material
Left- and right-hand numbering and angle system