I agree with the others. Very seldom use larger than a #1 and only then a #3. I do have #5's but I use them when I want to widen a kerf that I have already cut with a flat blade, to make it more visible. Remember, if you want to "sharpen" a corner you can change blades to flat to do that. There is no rule that says you can use only one kind of blades per project Good luck and have phun.