Product review (4 stars): Yep, it's a knob
While cleaning the knobs on my stove, one broke.  This Whirlpool control knob was all I needed to be back in business.  It fit perfectly, was easy to put on, and was a little to expensive for my liking.  I took a star off because I think it is ridiculous to charge almost thirty dollars for something that probably costs two dollars including labor.