DRITZ-Fons & Porter Pyramid Ruler. Cut pyramid shapes in a snap! This pyramid ruler is designed to cut equilateral triangles that finish from 1in to 6in in a snap. Features: coordinates with both the Fons & Porter Triangle Ruler and 60-degree Diamond 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 pyramid triangles are enclosed. Ruler is clear acrylic with black and yellow markings. Ruler measures: 6-5/8x7-3/4x1/8in. Made in USA.