This OLFA® 45mm rotary blade cuts up to six layers of fabric at a time, saving you precious time. Because the blade is made of tungsten tool steel, it retains its sharp edge, saving you money. The replacement blade fits any OLFA® 45mm rotary cutter. (RB45-1). Good For: cutting strips and multiple layers at once. Cuts fabric, paper, tarp, vinyl, upholstery and more.