Product review (1 stars): Rich knob, Poor Function and Design
That it is a black knob designed by Whirlpool as a replacement part for a white washing machine. More importantly,
it does not work well. The threads on the replacement part are not half as deep as the original timer knob.  As a result, the knob does not really work. It slips and does not have enough grip on the timer post to set the wash cycle. You have to manually grasp the collar under the knob to assist the knob's operation.  Guess you have to live with it or spring for a replacement timer ($100+) or new washing machine.

Shame on Whirlpool for a such a poor replacement part.