The SINGER 45 mm Rotary Cutter Replacement Blades are durable steel blades that are extremely sharp for precise cutting jobs. The replacement pack comes with five standard size 45 mm rotary blades in a convenient plastic storage case. These blades are perfect tools for precision cutting, even with multiple layers of fabric or paper. Designed as replacement blades for the SINGER Lock ‘n Roll Rotary Cutter, these blades are standard size blades that can also be used with other brands of 45 mm rotary cutters, including SINGER, Fiskar, OLFA, and others. These rotary blades can be used for everyday household tasks such as DIY projects and cutting cardboard or twine, for sewing and quilting projects that require cleanly cutting multiple layers of fabric, or for arts and crafts projects such as stenciling and scrapbooking. With so many ways to use these rotary blades, it’s always good to have a few replacements on hand. SINGER rotary cutter replacement blades are the ideal blades for sewists, craftivists, and hobbyists.