Bernina metal sewing machine bobbin.
For rotary hook machines with Bobbin Thread Monitoring.
Fits the following models:
1630, 180, 185, 450, 640, 580, 200 and 730
Does not fit Bernina Series 7 or Series 8 machines.
DIMENSIONS (approx):
Diametre: 21mm
Depth: 8mm
Diametre of central hole: 6mm