For quilting lovers, the Omnigrid Value Pack 1 Ruler is a must-have in their quilting tool collection. It comes with 4.5", 6.5", 9.5" and 12.5" squares. Each of these squares are engineered with extra 0.5" edges to measure diagonal angle lines for added convenience. Easily cut, square and trim blocks with these craft rulers. Details:ClearSizes: 4.5", 6.5", 9.5" and 12.5" squareSet of 4 quilter's rulersUse with a rotary cutter or straight-edge bladeDiagonal angle line and edge markings for accurate measuringHeavy-duty durable acrylic material with laser cut edges for smooth, deep cuttingDiagonal angle patented double-sight lines that show up on light and dark fabricsLeft and right hand numbering and angle system