1:18 classical guitar chord button

Product Name: Guitar triple chord button
Color: golden button body, black handle
Material: Black large oval handle + A3 steel plate + easy-cut iron string post + copper gear.
Gear ratio: 1 to 18
Features: divided into around, single hole plastic column! (Plastic column shaft diameter 9.8mm)
Remarks: Each row of chord buttons contains 4 screws. Produce