1.CNC grinded valve tappet . 2.100% QC . 3.Do not produce noise . 4.Free technical support . ... , industries and marine, etc.4) make of vehicle/engine: ISUZU, HINO, NISSAN, TOYOTA, MITSUBISHI, SUZUKI, LEXUS, MAZDA,DAEWOO, HYUNDAI, KIA, VOLVO ... and efficient service.4) Develop and produce new items according to your samples or drawings.---------------------------------Please contact us for inquiry or ...