DESIGNED FOR USE ON CLASSICAL GUITARS WITH A FLAT RADIUS. MICROMETER TENSION ADJUSTMENT ASSURES BUZZ-FREE IN-TUNE PERFORMANCE AT EVERY FRET. MICROMETER TENSION ADJUSTMENT ASSURES BUZZ-FREE IN-TUNE PERFORMANCE AT EVERY FRET. SINGLE HAND OPERATION. AIRCRAFT GRADE ALUMINUM CONSTRUCTION. ALSO AVAILABLE FOR ACOUSTIC AND ELECTRIC GUITARS WITH RADIUSED FRETBOARDS.