This is a trombone outer slide expander Ferree’s Tools #N11. It is used and in good condition with a little light surface rust. Also, the plating is worn at the end of the tool.

If you buy more than one item, I will send them together to save you money. The shipping calculator does not know how to combine items, so email me for the actual shipping cost, or I will give you a refund if you pay too much for shipping.