Musiclily 2+2 Sealed Bass Tuners Tuning Pegs Keys 2R2L Machine Heads for 4 String Bass Guitar, Chrome Economy sealed bass tuning keys set for Precision Bass or Jazz Bass Fits for common size 9/16 inch(14mm) peg hole Material:Metal Alloy; Gear Ratio 19:1 2x2 Tuners set; Nut,Ferrule,Screws included Package Incluedes:4 x Bass Tuning Pegs ;4 x ferrules;4 x screws(2R2L)