This is a jack plate made by Allparts. (Model number: AP-0615-001) I opened it, but I stored it without using it. I'm selling it because I don't plan to use it in the future. ■ Specifications Outer dimensions: 48mm (football shape) Screw hole spacing: 37mm Includes 2 screws Please refer to the following: https://www.gakkicenter.com/c/gr173/gr175/00727-00206539 Recommended as a custom or upgrade part.