Dritz-Omnigrid on point square. Used to cut small numbers of squares and trim or square up oversize half-square triangle units. Pieces measure evenly across their diagonals instead of from side- to-side. The on point square may look like a traditional ruler but the grid has non-standard measurements. This package contains one 6-3/4x6-3/4 inch omnigrid on point square with 1/2 inch margin for seam allowances made in USA.