Cooktop Burner Knob 318242221

I’ve been looking for these knobs. Best price here and they were delivered quickly

very easy to install .good strong parts . very readable positions

I was very grateful to be able to get this part unfortunately they tend to break within 3 to 4 years. The cylinder is made of plastic with a metal insert disk this is the 2nd time in 10 years I've had to replace and they are very expensive

Unfortunately even though these were the correct part number they didn’t fit. Perhaps a manufacturing defect?