For Singer models 1530, 1588, 1590, 1591, 118, 132Q, 177C, 223, 233, 237, 239, 1507, 1525, 1732, 3709, 3722, 3810, 3820, 4166, 5102, 5107, 5122, 5127, 5522, 5528, 6510, 6550, 7360, 7380, 9910, 9920 9940, XL100, XL1000, XL3400, XL5000, XL6000, Babylock BL2160, B17,
Pfaff Ambition 1.0, Pfaff Ambition 1.5, Pfaff Passport 2.0,

Outside diameter: 20.5mm
Height: 11.5mm
Axis diamter 6.2mm

Fits many top load machines including Janome and Kenmore Alternative number 416475801