The Omnigrip square rulers are used for secondary cutting of strips, and to square up finished quilt blocks. Use for quilting, sewing and crafts - or any DIY project that calls for cut fabric.Details:Clear with neon and black markings5.5" x 5.5"Extra 1/2" on two sides for seam allowanceDiagonal line for triangle cutsEdge markings for accurate measuringLaser-cut edgesLeft- and right-hand numbering and angle systemDouble-sight lines visible on light and dark fabricsNon-slip backingAcrylicFor use with rotary cutter or straight-edge blade