Incorrect Description. They are too small for 3/8" or 1/2" bolts/nuts. but too big for 1/4" screws so maybe 5/16" but I don't have any of those to try. The inner diameter of the cap is 15mm or about 0.59 inch [a 1/2 inch nut is about 13/16 inch or 0.8125 inch diagonally from point to point]. Made of chrome steel.
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