This is a 4-Speed Crank Axle Gearbox Assembly Set from Tamiya.
By altering the combinations of four gears, four different gear
ratios can be obtained: 126:1, 441:1, 1543:1, 5402:1.
Higher speed setting is suitable for car model, and so on.
Lower speed setting is suitable for tracked vehicle model, and so on.
Included motor operates on 3V.
Pictorial instruction sheet included.
One 4-Speed Crank Axle Gearbox Assembly Set.
Assembly
Phillips Screwdriver
Side Cutter
Hobby Knife
Adult Supervision