DESIGNED FOR USE ON 6-STRING ELECTRIC AND ACOUSTIC GUITARS. 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, EASY TO OPERATE TRI-ACTION GEOMETRY; CLAMPS TO THE HEADSTOCK WHEN NOT IN USE. AIRCRAFT GRADE ALUMINUM CONSTRUCTION. INTEGRATED PICK HOLDER STORES YOUR PICK IN A CONVENIENT LOCATION WHEN PLAYING FINGERSTYLE. US PAT. 8,779,262