Review on Upgrade Your Electronics With Taiss Silver Tone Rotary Knobs For 6Mm Shaft - Set Of 10 by Brandon Battaglia

I passed up the 6 mm knobs in favor of these 6.4 mm ones as they would fit 0.25 inch controls. They either do not know the difference or sent the (typically cheaper and common) 6 mm ones. They DO NOT fit the several shafts I tried them on. More trouble than it is worth, fortunately I have a small machine shop and can modify them, which makes them cost me ten times what they are worth!