This is a custom-made adjustable support. When in use, it's approximately 48mm long and fits models like Silky, Jerome Callet, and Jupiter Pocketra (SPT-416, JPT-416), which have a 48mm gap between the tubes. "L53" (sold separately) is suitable for BACH, YAMAHA, XO, etc. It's assembled with all new parts, but I attached and photographed it before listing to check its verticality, so it's not strictly unused. The instrument in the photos is not included in the sale. 【Installation Notes】 Do not use tools like pliers. Excessive torque can dent the tubing. Tighten gently by hand.