Metal bobbin suits older Toyota, Empisal, Bernette, Singer and Ricca machines, which have a front-loading bobbin case and full rotary hook mechanism

Suits older model Toyota, Empisal, Bernette, Singer, Riccar machines which have a front loading bobbin case and a full rotary hook mechanism. Also suits many brands of industrial straight stitch sewing machines.
Metal bobbin for free-arm machines

9.1mm high x 21mm diameter.