oldparker has it nailed. Those slugger wrenches are the real deal for big tight nuts, and an oilfield favorite. You can wail on them with a 14 pounder and they won't flinch.
In addition, the Wright brand is the military supply brand of OTC. They are just OTC with a different name. I have 3 sets of Wright 3/4" drive socket sets .. they are ex-'Nam Military socket sets, and the cream of my tool collection.
Remember that OTC were the preferred brand of Cat tools in the 40's and 50's and they came with a lifetime guarantee.
Even if your workshop burnt to the ground, OTC would take your tools and repair/heat-treat/recondition them, to as-new again, for only the cost of tool transportation - this is outlined in the Service Magazine of July 28, 1945. Can you imagine any tool company doing this, nowadays??
Wright slugger wrench - eBay ..
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290308760076