Simtyso&reg; Predmium Folk Acoustic Electric Guitar Banjo Trigger Capo Key Clamp This capo also fit the wider neck and flat fingerboards of the classical guitars or other guitars with straight frets. Can clamp on any fret. Spring action clamp holds capo firmly in place, keeps strings in tune. Can clamp on any fret,hold the strings nice and tight. Operate your quick-change comfortably with one hand.