Quilting Blade, 45mm Rotary Cutter Blades, (5 pack) Secret Behind the Sharpness - Although we cannot disclose the full secret, we can say that each Quilting Blade goes through 4 individual sharpening stages so you get a sharper, flawless cut every time. Fits All Rotary Cutters - Each Quilting Blade is designed to fit all rotary cutters including Fiskars and Olfa rotary cutters.