Bobbin Case- Left Finger Fits:15 class (except 15-91), and all zig-zag oscillator machines including 237, 239, 3012/13/14/15, 4015/16/19/22, 5102/07/22, 5123/24/27, 5522/28/30, 30215, 30518, 302, 305, 342, 345, and other non-Singer oscillators.