is set up by a group of senior technical engineers. It is a sub company of Zigong Sanhuan Machinery Manufacturing Co ltd, which was set up in 2006, for about 15 years now. Riva is set up mainly for exporting as more and more foreign clients enjoy our high precision goods and they speak highly about our quick action and our responsibility. Our engineers have over 15-20 years working experience in CNC parts and power transmission and factory automation, products are mainly, timing pulley, pulley, gear, rack, sprockets, and coupling and high precision cnc parts.