Product review (1 stars): Revised 10/13- Began to rust after a few weeks!
I got this to replace a broken knob on my slow cooker lid.  It was easy to install and didn't even require tools, but it may need to be tightened up later.  This can be done with a standard Phillips head screwdriver.  I didn't want to spend a lot since I bought the slow cooker on sale for $19.99 at my local hardware store several years ago.  I added this to another order to get free shipping and it seems like it will work great.  It looks like it could be used to replace knobs for other cookware lids as well.

UPDATE 10/13:

I am revising my review to down to one stars because after a few weeks of use the screw that attaches the knob to the lid began to rust.  It was obviously made of cheap steel and not stainless steel.  As a result, I would not purchase again.