This is a custom-made movable slide for a trumpet. Photos 3 onwards show examples of attachment to a case. It can be attached within this range, and the bell direction is limited to the example in photo 4 due to the existing slide. The instrument itself is not included in the sale. Although assembled with all new parts, it has been attached and photographed for inspection before listing, so it is not technically unused. Tightening the nuts in tight spaces can be difficult, but please refrain from using tools such as needle-nose pliers. Excessive torque could dent the tubing. Please tighten patiently by hand.