OMNIGRID Triangle Ruler for 1⁄4" Square Triangles - 8" (20.3cm)
Half square triangle for 1⁄2" square up to 6" finished blocks with 1⁄4" seam allowance built in! Made of strong and durable premium quality acrylic plastic. Unique black and yellow double sight lines for easy viewing when working with light and dark fabrics. Laser cut to within 0.002" accuracy with a smooth finish. Specially designed for right and left handed use.