Hi this is a brass shavings basket for the RCBS pro and pro 2 power Case Trimmer.  

Catch your brass shavings in the basket to avoid a messy work area.
Also has a build in holder for your pilot pins, (just slips over the edge of the tray, or can be removed)

Simply place the basket in place and that is it.

This item is 3d printed by me. 

Thanks for looking.

Trimmer and pilot not included. Just the 3D printed parts
Other model versions are available in my  store

NOTE: if you do not want to wait on the auction to end.  You can Buy it now In my Store