IKN Black Acoustic Guitar Tuning Pegs 3L3R Machine Heads Tuning Machines Guitar machine heads(3L3R) for steel string(electric or acoustic)guitars. Style:Sealed machine heads, big button style.Heavy duty internal gear. Button Size: approx. 21 mm width.Headstock Shaft:approx. 9.8mm diameter. Material: Metal.Color: Black. Package Included:3 x Left guitar machine heads,3 x Right guitar machine heads,6 x Ferrule,6 x Threaded bushing,6 x Screw.