Hi this is a brass shavings basket for the RCBS Case Trimmer-2. 

 (Note not for the rcbs original trimmer) I do have the original in my ebay store.

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)

Also comes with a chip guard (easy slips on)

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