parametric adapter, female to female, you can change the size from ½ in to anything you'd like in onshape. You can also change the depth of both of the holes. Originally designed for a ¼ in screwdriver, but it is parametric so if you somehow have something else, you can modify that dimension too. 

You can make a copy and edit with Onshape. Edit the variables to change the dimensions. 

Inner chamfers for strength

Exterior chamfers for aesthetics, elephants foot prevention, and preventing sharp edges 

I would recommend printing with a lot of side walls if you need even a small amount of strength. This is not a long term solution. If you have a socket set, use that and don't print this. Obviously. 

Yes everything is metric. Even though the dimensions I needed were imperial. Deal with it.