1/2 inch square drive coupler
thingiverse
This is a female-female coupler for 1/2 inch square drives. It has grooves for the spring loaded ball to help keep it in place. I made this so I can store things with a male end such as a hex shank socket adapter on my socket rails next to my sockets. The model can be scaled down to other drive sizes as needed. If requested, I can upload the other common sizes.
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