Question

what is this? * sewing machine needle bed stitch selector

Explanation:

A sewing machine is a device used to stitch fabric and materials together with thread. It has a needle mechanism (but the whole device is more than just a needle), a bed - like structure (but not just a bed), and a stitch selector (a part of it). The image shows the overall structure which is characteristic of a sewing machine.

Answer:

sewing machine