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The inside of the socket must be round, with no flats on it. Mine measures dead nuts-on at 5/8 of an inch inside dia.


If the wall of the socket is too thick, it might not reach into a nut that's flush the panel opening. The 1/16-in. wall thickness on this socket makes the overall OD 3/4 inch. The teeth are also 1/16-in wide.


The stainless version with the dimensions above is 4 inches long, with the upper 2 inches knurled to improve grip.


I'm just very pleased they hardened the thing. Much better than the car-antenna trim-nut tool.


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