Planet Waves PW-CP-06 Capo for Banjo, Mandoline and Drop Tuning, micrometer screw assures buzz-free in tune performance at thomann ervery fret, a patented Ned Steinberger design, one-hand operation, for Banjo and Mandoline with curved fretboard, for Drop Tuning for E-Guitar and Acousticguitar - for 4 Strings