Ningbo Zhongli Bolts Manufacturing Co., Ltd., yomwe idakhazikitsidwa mu 2003, ndi katswiri wopanga zomangira zamphamvu kwambiri pamachitidwe osiyanasiyana amitundu yosiyanasiyana, omwe akukhudza kudera la masikweya mita 10,000, likulu lolembetsedwa la 1500,000 RMB, ndi zokolola zonse pachaka za matani 8,000 pachaka. Kampaniyo yakhazikitsa nthambi zingapo zogulitsa m'zigawo zosiyanasiyana ku China. Pakadali pano, zinthu za kampaniyo zimatumizidwa ku Europe, USA, Middle East, Africa, Southeast Asia ndi madera ena. Kampaniyo ili ndi luso lamphamvu laukadaulo, zida zoyezetsa wathunthu ndi makina osiyanasiyana odziwikiratu okhazikika amitundu yambiri ozizira komanso otentha mutu, kuti akupatseni zodalirika komanso zapamwamba. 1, A490, mabawuti a hex DIN931, DIN933, EN14399, DIN6914