As I noted earlier I had some trouble with the other vendor selling J1772 adapters .. so got this from ModularEV Power. Had no problem, just went to their ebay store (http://stores.ebay.com/Modular-EV-Power) and picked one out and bought it.
It's a lot smaller than I expected. And it's well put together. Looked like a fairly simple thing to make - a sturdy box, two connectors, and a handle.
Nice warning stickers.
I haven't tried it yet because my membership cards with Blink and ChargePoint haven't arrived yet.