I have 18mm to 65mm cutters, have found 11 cutters so far in my room, One is on a ruler, I have olfa ,fiskars kai, martelli. a fiskars ruler, cutter, combo, and my gingher. I have a matt and cutter by each machine for small cuts and the others at my cutting table, in a drawer. I use the smaller ones for curved cutting and the largest one for cutting batting and trimming the quilt before adding the binding.