8-1/2in Heavy Gauge Acrylic. 1/4in, 1/2in, and 1in lines. Two Color for Easy Reading. Laser Precise. 1/4in Lines Provided for Seam Allowance. 30 degree Angle from Center Line. 60 degree Angle equilateral triangle. The 60 Degree Triangle Ruler is perfect for making any pattern that requires 60 degree angles. It is perfect for making a Thousand Pyramids Quilt or the Basket for Eleanor's current Block Party, Quilts from Eleanor's Attic. The Ruler is laser cut for precision and has clear and concise markings. Take the guess work out of your projects, the 60 Degree Triangle Ruler makes it easy and accurate! Quilt in a Day's 60 degree Ruler can be used with any designer's quilt pattern requiring an equilateral triangle. Finished sizes are from 1 inch to 8 inch, in 1/2 inch increments.