I was trying to get a screw in with limited clearance using a pair of pliers and a hex driver bit. Thinking there is a better way, I came up with this. It allows a hex drive screwdriver bit to be used with a minimum clearance but still allowing a fair bit of torque to be applied.

Update: As requested I've also made a smaller version for mini 4mm bits

Designed in Fusion 360. Thanks to the following YouTube video for helping with getting the knurling done.
https://www.youtube.com/watch?v=wNVtLVF99cw