Musiclily 4 Inline Sealed Bass Tuners Tuning Pegs Keys Machine Heads Set for Precison Bass or Jazz Bass, Chrome Economy 4 in line Sealed Bass Tuning Key Set for 4 string bass guitar Fits for common size 9/16 inch(14mm) peg hole Material:Metal Alloy; Gear Ratio 19:1 Nut,Ferrule,Screws included Package Includes: 4 Pcs Bass machine heads