Crystal chamber with 1.14in OD, Part 1 - metal shell.
For MHS extension, and can be used with
Double male with slots style 2 (the design matches the slots on this extension).
Check this post: http://goth-3designs.com/instructions/diy-crystal-chambers/
Depending on the material used and due to the printing process accuracy, parts might need a bit of sanding here and there to fit properly.