You can buy aftermarket ones for specific applications that work better and fit better than generic plastic ones, like a Coats and Clark invisible zipper foot will be a lot better than trying to half *** it with the universal zipper foot that came with your machine. The foot has a automatic measuring thing on it. I can put just about anything on the foot and the machine automatically figures out the needed length of the hole up to about an inch and a half or so. I might add it's a manual thing too, it's not a digital machine. It has a trigger stop thing that changes needle direction instead of me starting and stopping the buttonhole 4 times and messing with setting in between rotating and aligning the fabric. Doing a buttonhole old school style is a pain in the ***. But we buy machines to suit our needs, mine is very simple and built like a tank.