This New and improved Triangle Square Up Ruler makes perfect half triangle squares or quarter triangle squares in half the time. Features tip grooves to trim tips at 1" & 1/2" increments. Squares patches up to 4 1/2 inch. The ruler is marked in two colors for easy reading and coordinates with the most popular ruler brand. Convenient 1/8 inch, 1/4 inch, 1/2 inch and 1 inch lines for precise measuring.