The Omnigrid® 8” half square triangle ruler is used to create half-square triangles for finished quilt blocks up to 8”; it has seam allowance calculations included in the measurements; it is easy to manipulate for smaller triangles when quilting.In general, Omnigrid® triangle rulers are used to cut half-square and quarter-square triangles; seam allowances are included in the measurements, which are based on the finished size of the quilt block.Use with a rotary cutter or a straight-edge blade.The half square triangle 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 numbering and angle system
