TIPS:
1,The other measurement you can use is the width of the foot shank where the foot Snaps-On.
2,Pfaff feet are mostly 8mm
3,Austin, Brother, Singer, Janome, Toyota, Baby lock, Silver, Necchi, ER Classic and many more are mostly 6mm
4,Husqvarna are 5.5mm
5,Singer Narrow Slant Shank and Narrow Short Shank are 1.5mm
6,Most machines made since 1980 use Snap-on feet.
7,All Bernina Sewing Machines need a "Low Shank Adaptor" which will then allow you to use the standard Snap-On style feet.
8,Singer Slant IS FOR SINGER SLANT MACHINES only. (All other Singers have Snap-on or screw on feet.)
9,All Featherweights use low shank feet. They are centre needle position machines.
10,For super high-bar lever-style Kenmore, use a High-bar adaptor.