Product review (4 stars): Knob for glass pan lid.
It's a fine quality metal knob for a glass lid with a hole in it.  It comes with a large enough screw to fit through the hole and into the knob.  The screw was easy to tighten with a screw driver.  I bought this to replace another knob that cracked.  So this fits and works well.  It's not as solid as it could have been.  And the piece underneath the knob does fit over the glass, but not as conforming to the glass lid as it could have been.  But then the knob was an add-on, and not manufactured to exactly match every glass lid.  On the other hand, for not being the original knob, it does do the job!