Wow the Walmart ad does say 1/2 but I've never seen 1/2 chicken wire.....might be an error.
There is 1/2" chicken wire, I use it on the bottom 24 inches of my chain link divider wall inside my coop, to keep small birds from getting adventurous and trying to squeeze through the chain link... I could have used regular 1" chicken wire but I got the roll of 1/2" stuff at Goodwill brand new for $1 and figured it was a good use for it...