This Omnigrid ruler includes 30 degree, 45 degree and 60 degree angles. Use to cut, square and trim quilt blocks. Great for lap work, baby quilts and checking finish size of blocks. 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.