DRITZ-Fons & Porter Diamond Ruler. This 60 degree diamond ruler is designed to cut diamonds that finish from 11in to 6in tall. Features: coordinates with both the Fons & Porter Triangle Ruler and Hexagon Ruler (not included), this ruler does all the math for you, easy-to-understand directions printed on the ruler and easy- to-understand instructions with photos and ideas for combining 60 degree diamonds and related shapes are enclosed. Ruler is clear acrylic with black and yellow markings. Ruler measures: 13x7-1/2x1/8in. Made in USA.