Two-Part Thread Tension Knob for Industrial Sewing Machines
Thread tension knob for industrial sewing machines, with the tiny steel bar that helps hold it in place. Made to work with many makes of Juki and Singer industrial machines, but please check dimensions listed here carefully to make sure it fits with your machine.
About 2" long end to end, by about 1" wide. The part of the knob that fits into the machine is 16.85mm in diameter by 16.5mm deep. (About 11/16".)