Threads did not fit my lamp.

I purchased this item to replace a round polished knob on my bedroom wall lamp as it is hard to turn at times. Since there is no information about the thread size, I took a chance and they did not fit. There is a brass extension on the plastic knob portion and both are the same thread size (too small). Why the seller can't take the time to find out what the thread size is, and list it, is the reason I give it two stars. Also the reason I returned them.

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