The Multi-size Peaky and Spike triangle tools (2 pieces to cut 2 shapes) makes it easy to cut any size Peaky and Spike triangle set from 1 to 6 inches by half-inch sizes. You can trim the engineered corners, just like those available in exact-size templates From Marti Michell. With this multi-size tool, you can audition different size triangles. It's quite economical because you can cut 11 different sizes this one tool set. Companion tools (sold separately) are the Multi-Size Half-Square Triangle Ruler #8290 and the My Favorite Squaring Up Ruler #8973. The late Doreen Speckmann named these shapes Peaky and Spike, and the names became famous around the world.