... Design 3.OEM/ODM offered 4.big output Small Plastic Helical Gear Set Paramer 1.number of teeth:22 and 30 2 ... requirement;9):Quality control equipments:Roundness Meter,Projector Meter, Microscope, Gear-test Meter, Surface measuring Meter and so on;10):Products ... , we specialize in producing a variety of gear types including:Spur Gears (internal and external) Helical Gears (single and double) Worm Gears ...