Dujiangyan Ningjiang Zonghui Precision Small-sized Worm Co., Ltd is a processing factory specialized in nonlinear helical tooth flank type of precision small-sized worms produced through international advanced milling method, and wide variety of precision gears. The general machining accuracy is up to Grade 6 of GB/T10227-1988, Grade 8-10 of AGMA and below Grade 9 of DIN Standard.

The company is highly qualified in the field due to its technical team composed of some national class experts, even including one with more than 50 years of experience, and due to some world class machining equipments such as Swiss licensed CNC worm milling machinery, CNC horizontal gear hobbing machinery and CNC lathes, and inspection instruments like US Gleason M&M??7 gear measuring center, German Klingelnberg gear measuring machine, worm helix tester, and gear composite error tester. The annual production capacity can reach 10 million pieces.