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1/2" ground rod ??

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One of my customers purchased ground rods for me to install in his pole barn service. As I looked at them I noticed they where only 1/2 inch OD. I did not put them in. I assumed that ground rods must be 5/8 OD. This is from NEC 250.52 (5) (b) but it states at the end " unless listed "

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infinity

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Location
New Jersey
Occupation
Journeyman Electrician
It should have a NRTL marking directly on the rod. UL is often stamped right into the metal. If they're UL listed rods.
 
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