This is a custom-made, adjustable support for a trumpet. When in use, the length is approximately 53mm, and it fits trumpets like Bach, Xeno, and ZORRO. It will not fit instruments like Schilke or Jerome, which are around 48mm. A different, shorter type (L48) is required for those. This is a product made by an amateur, not a professional, but the soldering was done well. It is assembled with all new parts, but it was attached and photographed for inspection of its stability (verticality) before listing, so it is not strictly a "new" item. Photos 2 and 3 show examples of it being attached to a Bach trumpet. The instrument itself is not included in the sale. 【Installation Notes】 Do not use tools such as pliers when installing. Excessive torque may dent the tubing. Tighten gently by hand.