Just wanted to mention for those who bought the DSE tool set (came in a green case). I used mine today on a particularly stubborn screw and ping, something flew across the room. Took me 5 minutes to work out what had happened. But the tiny ball bearing that holds the tool bit into the screw driver shot out and darted across the room.
So yeah, just a note. Pop a small piece of electrical tape over the hole/bearing (not too tight) to stop the issue.
Still havent found the ball bearing :(