Vettster, Those "serrated scissors" are called "pinking shears". Their purpose is help keep fabric from unraveling. 70 years ago I watched my mother using her pinking shears, and she was very protective of them. I think my wife inherited them, and they are somewhere here in the house? They now make "rotary pinking shears". I use a rotary cutter for cutting glass cloth, but I've never used a rotary pinking cutter. Anyway, good luck.