IKN 3L3R Black Metal Auto Lock Electric Acoustic Guitar Tuning Pegs Machine Heads Auto Locking Tuner Guitar Machine Heads for Electric Acoustic Guitar Parts Replacement. Heavy duty internal gear.Location:3L3R. Button : approx. 20mm/0.79inch width.Shaft: approx. 6mm/0.34 diameter. Material: Metal,Exquisite appearance with perfect workmanship and high-tech finish.Color: Black. Package Including:3 x Left machine heads,3 x Right machine heads,6x Ferrules,6 x Threaded bushing,6 x Screws