The top-of-the-line GOTOH 510 series tremolo unit. This item allows you to change the vintage-spec bridge (string spacing 11.2mm) to a 10.5mm narrow pitch. (Search for GOTOH NS510T-FE2 to find the manufacturer's product page, where you can check the detailed specifications and compatible models.) All accessories are included. I think it's in relatively good condition for a used item, but there are some minor scratches and the instruction manual is a bit creased. Please be aware of this.