1. High-quality aluminum alloy die cast gearbox, light in weight and non-rusting.
2. Smooth in running and low in noise, can work long time in dreadful conditions.
3. High in radiating efficiency.
4. Good-looking in appearance, durable in service life and small in volume.
5. Housing: Die-cast aluminum alloy (frame size: 025 to 090); Cast iron ( frame size: 110 to 130 ).
6. Ratio ranges from 7.5: 1--100: 1.