These are 90 degree blocks (2) for making items with 3/4 23.5mm inch EMT Conduit. These are apart of the MPConduit Connector Set which you can use to make your own projects with as you choose. Please make sure to check out other sets and kits available on here. More coming soon I will have other version available in the future but for now I am only doing up the designs for 3/4inch Conduit.
If you have any questions regarding this item please feel free to contact me.
Most of these deisgns will be up on thingiverse as well
here.