Sperzel have been manufacturing machine heads (tuning keys) since 1977, and in 1983 they created the Trim-Lok locking tuners. By simplifying string changes and keeping guitars in tune, their innovation instantly became an industry standard. No locking nuts or string trees required; just beautiful, elegant, brilliant design. Sperzel tuners are frequently found on top-of-the-range guitars from the very best guitar manufacturers, including Fender, Yamaha, Parker and many others. Often copied, there is nothing that does the job quite like a true American-made set of Sperzel tuners. Still a family business, Sperzel have put their name on every tuning key since 1977.