The Omnigrip 8-1/2"" square has a diagonal line for triangle cuts; the ruler has extra 1/2"" on two sides for seam allowance.

• In general, 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
• Use with a rotary cutter or a straight-edge blade
• The 8-1/2"" square ruler has the following standard Omnigrid / Omnigrip features:
• Patented non-slip backing to hold fabric in place during cutting
• Edge markings for accurate measuring
• Laser cut edges for smooth, deep cutting
• Patented double-sight lines that show up on light and dark fabrics
• Diagonal line for triangle cuts