Chrome - Zinc Saddle Vibrato. Chrome.Zinc saddle, 10.5mm string spacing.Complete with screw-in tremolo arm and screws. Traditionally referred to as “tremolos” these units have, technically speaking, been misnamed for over 50 years. At GUITAR TECH, we prefer accuracy.Tremolo is amplitude modulation; Cyclical changes in perceived volume. The pitch change caused by the devices traditionally referred to as tremolos, is actually VIBRATO. Hence our use of the term