Bloc Loc Half Square Triangle Square Up Ruler 6.5"
Make perfect squares and triangles every time!
You'll never be caught without the right size block again! These grooved rulers lock onto a seam, eliminating slipping, sliding, rocking and all-around frustration. There are perimeter markings to 1/8" and solid, easy-to-read markings every 1/2", so you can cut and measure quickly and easily with absolute accuracy. Package contains 1 (6 1/2" x 6 1/2") acrylic ruler. Made in the USA.