Schaller BM Bass Tuner 1R BC, Single Machine Head for Electric Bass, Orientation: Right, Construction: Open, Gear ratio: 1:20, Shaft length: 21 mm, Bore: 17.5 mm, Attachment: Screw(s) & sleeves, Schaller No. 10250471.26.71, Surface: Black Chrome, Includes fastening screws and counter bearing, Made in Germany