SK plug socket find

[alton1911]

I found some male and female SK plug sockets. They are all 3/8 drive and they are all square on service side. Except the one on the right is 1/4 hex. I assume it’s a bit driver.


Thanks
alton1911

 

[notlob]

According to zoro, they are "female pipe plug sockets". Now I know what some of my odd 4-point sockets are for!

https://www.zoro.com/sk-professional-tools-fem-pipe-plug-socket-38-dr-38-square-41443/i/G5103883/