Circular rotary replacement blade for Olfa's popular 45mm rotary cutters used for quilting, sewing, and general crafts. Cuts up to 6 layers of fabric. This blade is made of high quality tungsten steel for unparalleled sharpness and superior edge retention. For Original 45mm Rotary Cutter (RTY2), Deluxe 45mm Rotary Cutter (RTY2DX) and Quick-Change Rotary Cutter (RTY2NS). 1 blade per pack. Good For: general quilting, sewing and craft projects. Can be used in industrial application