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This is the renowned Gotoh two-way adjustable rod! It is the same type of rod that Martin™ Guitar is using. This rod is made by Gotoh™, consists of a U-channel .360” deep by .400” wide and 15.15” long. Overall length of the rod, including the nut is 15.94”, the nut is .79”. A rod .200” is flattened at one end and welded at the boxed end. The nut (.356” OD), which extends out from the rod .79” is captured by a collar welded into the channel. Plastic spacers keep the rod centered in the channel, while preventing rod buzz. THE GIVEN DIMENSIONS ON THE PIC ARE IN MILIMETER !