I like that it comes with an adapter to use in a cordless drill. It worked well on a square headed set screw and a 3/8" nut with rounded corners. Not sure if it would stand it so I don't think that I will use it with an impact, but a cordless drill or ratchet is OK. It is a handy addition to my toolbox. I haven't used the hex keys, but they are handy and should work well when needed. I wouldn't trust them when a high torque is needed but is good for what it is. This socket is great when a fastener has rounded corners, and a wrench or regular socket won't get a bite. The holder works well. Overall, I'm happy with these tools.