This is the separate crystal holder for Part05 2.0 (for both versions 14650 and 18650 and Metal Master).
If you want this part in a different material as the part05 you can now order it separately.
Remember that this crystal holder comes with each part05. If you do not need different materials then you don´t have to order an additional crystal holder.
You can get all assembly parts here: Shop
For more informations and instruction manual klick here.