... anti-corrosion ISO9001:2008; tolerance: +/-0.0001mm high precision rc worm gear for toy car Specifications:1) Suitable for various automotive, electronic ... , etc. 3)Quality control equipments: roundness meter, projector meter, microscope, gear-test meter, surface measuring meter and so on4) Precision/tolerance ... output of over 1 million pieces per month. high precision rc worm gear for toy car