Schaller BM 4L Nickel, Machine head set for electric bass, Design: 4 left, Construction: open, Gear ratio: 1:20, Shaft length: 21 mm, Bore: 17.5 mm, Mounting: screws and bushings, Schaller No.: 10250101.26.71, Surface: nickel-plated, Includes mounting screws and counter bearings, Made in Germany