The OmniCraft square ruler is used to "square up" quilt blocks, needlework or other crafting mediums. It's ideal for quilting, sewing and crafts - or any DIY project that calls for cut fabric.Details:Clear with purple and black markings12.5" x 12.5"1" to 12.5" measurementsEdge markings for accurate measuringLaser-cut edges for cuttingLeft- and right-hand numbering and angle systemDouble-sight lines visible on light and dark fabricsAcrylicFor use with rotary cutter or straight-edge blade