This is a truss rod nut used in Music Man guitars such as the AXIS. It comes with a resin washer. This item is unused. The size is 4.8mm inner diameter for the mounting screw (inch pitch), 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 truss rods that are 5mm in size. Whether or not this can be used on Music Man products depends on the model and year, so we cannot confirm compatibility. Also, we cannot answer questions like "Will this fit model X?" as we are unable to test it on those models. Therefore, please first check if your guitar's truss rod is the 4.8mm inch size. Please determine if it is compatible and bid at your own discretion and responsibility. We cannot offer any returns or exchanges if the item does not fit after purchase. The items in the image are all that are included in the sale. Although this item is unused, please refrain from purchasing if you are overly concerned about minor imperfections. Instant purchase with no comments is OK. Please note that this item will be shipped via regular mail, and as per the post office regulations, there is no guarantee of arrival or compensation for damage. Please be aware of this before bidding. Also, we are sorry, but we cannot accept price negotiations.