Guidelines 4 Quilting - Finger Guards for Regular Acrylic Quilt Rulers for Rotary Cutting SafetyRotary Cutters are Sharp! Put These on Your Ruler to Protect Your Fingers When Cutting.Guidelines 4 Quilting Quarter Square Triangle Seam Allowance Addition gives you an easier way to cut fabric into quarter square triangles quick and easy. No Math required. Made in USA.Product Highlights: Puts a half inch high barrier between your fingers and the rotary cutter. Includes two 11 3/4" long Finger Guards that attach securely with three suction cups to any standard acrylic ruler. Get two to use on a 24" ruler. Easy to attach and easy to remove so you can put one on your 12" ruler, line two up on your 24" or move them to adjacent edges of your square when squaring up. Made of virtually unbreakable polycarbonate. Replacement suction cups are available.