The Omnigrip On Point Ruler is an innovative cutting tool used to create squares, rectangles or triangles that will be set on point when quilting. It creates cut pieces that will measure evenly across their diagonals instead of from side-to-side. The On Point Ruler has a clear half inch margin on all four sides, providing the quarter inch needed for seam allowances.Details:Clear with neon and black markings6.75" x 15.25"Non-standard measurementsEdge markings and laser cut edgesDouble-sight lines visible on light and dark fabricsLeft- and right-hand numbering and angle systemNon-slip backingAcrylicFor use with shapes with 90° anglesFor use with rotary cutter or straight-edge blade