Creative Grids 90 Degree Double-Strip Ruler
The Double-Strip ruler is one of a range of strip rulersdesigned to make cutting 1/2-Square-Triangles, 1/4 Square-Triangles, 90 degree Triangles, Trapezoids and more from2-1/2in widestrips quickly & easily! One side of the ruleris to cut strips and the other side has relevant triangles.