I have an old KD Tools hand impact driver, the kind you hit with a hammer to loosen frozen screws. It's a great tool, but the shanks on the bits are that odd 5/16ths size and very hard to find. These fit perfectly and appear to be high quality and well made. Haven't failure yet but I've only just got them. I'll update my review if they fail down the road.
Rating:
[5 of 5 Stars!]