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.