One tool for cutting both triangles for kaleidoscope blocks the fun, fast, easy & accurate way! This ruler not only gives you the triangle you need to make the Kalediscope pinwheel but also the template you need to make the complete block. Two templates in one! Hard and durable acrylic ruler will make perfect blocks from 2″ to 8″ quickly and easily. This Kaleidoscope Ruler is shown on “Fons and Porter’s Love of Quilting” TV show. Complete easy instructions are also included. Great for stack and whack, crossed canoes, and spiderweb blocks too!.