GNBY418593A - Uniden PRO510XL, PRO520XL, PRO538W Replacement On/Off Volume Control Knobs
The outside diameter of the base is just over 1/2 inch.
The outside diameter of the knob is 3/8 inch.
The inside diameter is 5/16 inch.
Shaft length is likely just about 1/2 inch.
There is no set screw.
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