This OLFA pinking rotary blade adds a zigzag edge while you cut fabric and craft materials with a compatible 45 mm cutter. One 45 mm (1.77 in) stainless steel blade is included for creating decorative edges that can help reduce fabric fraying. Use only with the OLFA 45 mm Deluxe Rotary Cutter, engage the safety cover during changes, and store the blade in its case A pinked edge can be useful for seams, appliqué, and craft decoration.