I have the straight Olfa and ergo Olfa and I have the Fiskars, and Fons and Porter and the new quick change Olfa and the Dritz and special flowered color designed one(When in doubt put a new cutter in MOM's Christmas stocking) and a pink one and a pretty light green one and a pretty chrome one. All the blades that are the same mm size fits all of them with no problem.