The weather here rusts them if they sit idle for while, most of my craftsman pliers looked like his unless I left them coated in grease or spayed them down to keep them covered. Sitting in the home box they where not often used and the temp swings just enough to rust them. If I wiped them down and just put them away next time I used them it would have rust pits, only way to stop it was spray them down with something before putting them back in the box. The coating on the WF craftsman stuff was never the best.
BTW Harry I used to work with your bother at liberty...
Kyle- aka K2 When I was there.