Metric hex allen keys wrenches info

At Auto Zone today I found they sell a 3 pack of 1/2" socket drive hex keys for metric sizes of 12mm, 14mm and 17mm. All three in the package for $7.99. The 12mm is what you need to change your oil in the 308 and to remove the fill plug on the 308 transmission. I'd previously looked high and low for these when I first tried to change my oil. Most metric sets only go as large as 10mm (which isthe size for a 308's transmission oil drain). Sears also carries a 12mm hex wrench but that is about 8 bucks by itself and isn't a socket drive.