Ideal blade for medium to heavy-duty projects, cuts multiple layers. Circular rotary replacement blade for our 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 carbide tool steel for unparalleled sharpness and superior edge retention. For Original 45mm Rotary Cutter (RTY-2/G) and Deluxe 45mm Rotary Cutter (RTY-2/DX).