Product review (1 stars): You get what you pay for
The knobs were cheap, and I should have realized that what I saved in money I would lose in time spent trying to make them work. I didn't realize exactly how knobs work before I bought these, but understanding that is essential to understanding why these don't work. You push the knob in and turn, but what is really required is for the post on the stove to be pushed in, so that a little latch mechanism will disengage, allowing the post to turn and adjust the heat to the element. In order for all of that to work, the hole in the knob needs to be more shallow than the post is long; otherwise, you end up pushing the knob all the way in but the post hasn't moved so the latch mechanism hasn't disengaged. And that's where the problem here arises, because the inside of the knobs is entirely hollow. What that means is that, unless you have a stove with extremely long posts, there isn't anything for the posts to push against and you end up without any way to disengage the latch mechanism. You can still make it work, but you have to find something with which you can fill the inside of the knob, remembering that the knob will be on a stove, so whatever you use shouldn't be flammable and cannot melt. Very disappointing.