I attached an image of 5 different 1/2 to 3/8 adapters I have. The best of them came from a TSC store, stamped Cro-Mo, is their JobSmart store brand and was single carded on the tool rack. I bought that adapter as replacement for one I instantly broke when I put a shallow 18mm 3/8 impact socket and adapter combo on my Milwaukee HITW in a pinch
And it was like $5 bucks
http://www.tractorsupply.com/tsc/product/jobsmart-1-2-in-fx-3-8-in-m-impact-adapter
I like the way its tapers down and would think its a slightly stronger design.
1/2 to 3/8 reducer is like the most common you ever break right
It is the first one on the left in the photo link.
2nd from left is an HF I bought a very long time ago part of a 3 pc set that included a 3/4-1/2 adapter and reducer.
The middle one #3 is another purchase from the TSC again (part of a 8 pc set in a bulk bin sale earlier this summer 8 pcs $10)
#4 is an the ARES adapter and from that same 4pc set seen in the prior posts cant say its really anything to write home about and looks no different than the no name (may be a CalHawk) one next to it.
And all these other 4 are stamped CrV
That Ares has a website
http://www.arestool.com/ But I've only seen them on Amazon and don't know how else they market their products. I tried their 6 inch 1/4" hex shank adapters they were so crooked I made contact arrangements to send them back they just said keep them and sent me another set. 2nd set was better but not great. You can find them on amazon too
TSC has similar ones for 1/2 the price and seem just as good
Just an FYI if anyone maybe looking for some various impact adapters (CrV though) TSC has a large 8pc set in store right now $14.99 includes 3/4" options too. Stock looks to be limited though
http://www.tractorsupply.com/tsc/pr...t-8-piece-hd-socket-impact-socket-adapter-set