Purchased from Sound House in 2014. I am the first owner. Missing mounting screws. [Product Specifications] Chrome-colored BIGSBY tremolo unit B50, ideal for flat-top solid guitars. Based on the B5 design, it is made of aluminum using the die-cast method. ■ BIGSBY Tremolo Vibrato Unit ■ Lightning Series ■ B50 Type ■ Specifications ・ Manufacturing Method: Die Cast ・ Material: Aluminum ・ Weight: Approximately 290g ・ Maximum body length: Approximately 109.5mm ・ Maximum body width: Approximately 96.8mm ■ Included items: Mounting screws (missing), tension spring, washers ※ Because the size is slightly different from B5, it is not compatible with the VIBRAMATE mounting kit, but the BIGSBY-specific string retainer Spoiler is a compatible part. ※ Installation and replacement of parts require modification.