Easily measure and mark scant 1/4-inch seam allowances for sharp mitered corners, accurate quilt blocks, and precise set-in seams. The Prep-Tool also helps you trim points on half-square and quarter-square triangles or diamonds, to make accurate Flying Geese, Square in a Square, and 9- or 16-patch quilt blocks. Its raised gold lip edges align precisely with mitered corner strips, half-square triangles, quarter-square triangles, and diamonds, making it quick and easy to mark a scant 1/4-inch seam every time. Made of virtually unbreakable polycarbonate, this tool is built to last and designed for quilters who want clean cuts, sharp points, and better results.