The 45mm Tungsten Tool Steel Rotary Blade cuts up to six layers of fabric at a time to save valuable time. The industrial strength tungsten tool steel retains its sharp edge for cutting heavy-duty industrial textiles, leather, technical fabrics, vinyl, fiberglass, and more. Blades can also be used in automated cutting applications. Fits most 45mm rotary cutters. Available in packs of 1 or 5.