#2 and #3 are basically the same foot but they look slightly different, so I'm guessing they're for different machines. They might be quarter-inch feet but you'd have to measure to be sure. #1 foot is for straight stitch only; see how the hole for the needle isn't very wide? Don't do any zigzaging with that foot, you'll break the needle and possibly throw the timing off on the machine. #5 is a rolled hem foot.