This is a trombone handslide crook dent ball driver/retriever tool; Ferree’s Tools #P53. You will need the N57 dent ball set (Not included) in order to use this tool. It is about 39 inches (1 meter) long. The cable is bent at the end, but it is in good functional condition.
The shipping calculator sometimes charges too much. If it is over by more than a few dollars, I will give you a refund for shipping. Also, if you purchase more than one item, I will send them together to save you money.