... qualityinspector & special instrument. 2.high quality 3. excellent perf gear ringdiesel \gas engine partslow price\good quality\advance techicalOEM product ... gensets,gas engine and gas gensets,these are widely used for oil field,railway,metallurgy,petrifaction ,navy vessels,fishing vessels,normal ... testing center,physical & chemical test center and measuring center. gear ring/gear ring for engine