This small, very powerful metal gearbox kit is ideal for driving model railway locomotives in various scales. Whether a new model locomotive needs to be powered or a defective gearbox needs to be replaced, this metal gearbox fits perfectly even in the smallest models. Especially enthusiasts of smaller models, such as 1:87, appreciate the optimal dimensions (30 mm long x 10 mm high x 8 mm wide including motor). This version is particularly suitable for flat models or when there is a clear view through the vehicle frame. With a very wide voltage range of 2 – 18 volts, the gearbox can be operated at any time with a railway transformer. Since the metal gearbox already exhibits a very high efficiency at 7.4 volts, battery-operated model locomotives can also be powered at any time. The gearbox also shows its strengths in RC modeling. Whether as a vehicle drive or for other motor-driven auxiliary functions, the metal gearbox is perfectly suitable for 1:43 or larger models. The gearbox comes fully assembled.