1:Helical gear reducer 2:Hardened ground helical gears and shafts 3:Metalic double lips oil seal 4:CE,ISO900 certifications ... are made of high wear-resisting alloy materials, specially treated and finely processed. Advantages: 1:Compact design, small volume, nice ... 3:High efficiency, low energy consumption, excellent function, small vibration, and low noise. 4:All - purpose use, convenient, low cost ...