This Olfa blade is brilliant if you are after a decorative finish on your crafty makes.  It creates a wave finish that's both decorative and functional helping to stop your fabric from fraying. 
This blade will fit a standard 45mm Olfa rotary cutter and it will fit a Fiskars rotary cutter, as many generic 45mm rotary cutter blades are designed to be compatible with both brands. However, it's crucial to ensure the blades are the same size (45mm) and that the center hole shape is identical, as some older blades on older rotary cutters may have a different shape.