Product review (3 stars): Good cheap knobs.
These are a fine, inexpensive set of knobs. They are from the 70s, but they work. They also cost for the set, what one knob costs.
The inserts are all for the same size valve. Not the size that I needed. Some high temp silicon gasket sealer took care of the difference. Different inserts would be better, but they are $9, what do you expect!