This is the correct blade to use when working on more heavy duty projects. The tungsten tool steel blade, OLFA's largest rotary blade, cuts up to eight layers of fabric at a time. This blade stays sharper longer, thanks to its high-quality construction and material. This blade can only be used with Olfa® RTY-3/G, RTY-3/DX and RTY-3/NS (any Olfa® 60mm cutter). Good For: cutting strips, multiple layers and finishing quilts prior to binding. Cuts fabric, paper, tarp, vinyl, upholstery, leather and other thick textiles.