IKN 6R Black Auto Lock Electric Guitar Tuning Pegs Metal Tuners Machine Heads Auto Locking Tuner Guitar Machine Heads for Electric Acoustic Guitar Parts Replacement. Location:6R, Heavy duty internal gear. Button : approx. 17mm/0.70inch width,Headstock Shaft:approx. 10mm/0.39inch diameter. Material: Metal,Exquisite appearance with perfect workmanship and high-tech finish.Color: Black. Package Including:6 x Right machine head,6 x Ferrule,6 x Threaded bushing,6 x Screw.