This is a truss rod nut used in Music Man guitars such as the AXIS. It comes with a resin washer. This is a new, unused item. The size is an inch pitch with an inner diameter of 4.8mm for the mounting screw. The outer diameter of the shaft is 8.9mm, the length of the shaft is 19mm, and the outer diameter of the wheel part is 19mm. Please note that this cannot be used with domestic 5mm size rods. Whether or not this can be used on Music Man products depends on the model and year, so we cannot answer that question. Also, we cannot answer questions like "Will this fit model X?" because we are unable to test it on those models. Therefore, please first check whether the rod in your guitar is the 4.8mm inch size. Please make your own judgment and take responsibility for whether or not it can be used before bidding. Please understand that we cannot provide support if you say it doesn't fit after you win the bid. The items in the image are all that are being sold. Although this is a new item, please refrain from purchasing if you are overly concerned or persistent. Instant purchase without comment is OK. In addition, this item will be shipped by non-standard mail, and according to Japan Post regulations, there is no arrival guarantee or compensation for damage. Please understand this before bidding. Also, we are sorry, but we cannot accept price negotiations.