This Shuttle Hook will fit:
CONSEW: 30 CLASS
SINGER: 31-15 78 331K 431D
This Highest Quality Shuttle Hook is also sold under the following Part Numbers:
115 00 110 210C 12393 37854 C30/12393 SH31 SH32
This World Class Quality Shuttle Hook has been fabricated to the same identical specifications as the Original Shuttle Hook.
What is a SHUTTLE HOOK?
Your Bobbin case fits into your sewing hook, either a ROTARY HOOK or a SHUTTLE HOOK. Turn the machine in the normal direction slowly and observe the Sewing Hook. If it rotates continuously then it is a ROTARY HOOK. If it travels back and forth, then it is a SHUTTLE HOOK.