Schaller M6 135 single Left-side tuner Locking chrome 

Gear ratio 1:18, weight button metal small/large 39g/41g, Perloid 33g/34g, Ebony 34g/35g, Galalith 34g/35, Polybone 34g/35g per piece, drill hole button: diameter 4.2 mm with driving surface 3.6 mm. 6 threaded bushings (only for posts for solid headstock), 6 step washers, 6 mounting screws.