The Omnigrip square ruler is used for secondary cutting of strips, and to square up finished quilt blocks. It's ideal for quilting, sewing and crafts - or any DIY project that calls for cut fabric. This ruler includes diagonal line for triangle cuts and markings for half-square and quarter-square triangles.Details:Clear with neon and black markings5" x 5"Edge 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