Binzhou Zhengdao Mechanical Manufacturing Co., Ltd., BZD, is located in Binzhou Economic Developing Zone of Shangdong Province, China. BZD is the leading manufacturer of high-end-quality ALFIN rings (also called piston ring carrier, piston ring carrier inserts or NI-wear-resisting inlay ring) in China. BZD is specialized in High and Medium Nickel Austenitic Cast Iron Ring Carrier Inserts for aluminum pistons. The founder and president, Mr.Su Daosheng, is the pioneer in this field in China. He possesses a series of patents for Piston Ring Carriers in China. He established the only piston ring carrier research facility in China, named Binzhou Zhengdao Piston Ring Carrier Insert Research Institute. We are among those who have the most advanced testing equipments and automatic production lines in the world. We have built a high standard quality assurance system. We are TS16949 certified. We offer custom Nickel Piston Ring Carriers and those with different types of cooling channels. The advantage of the later is that they lower the pistons� working temperature hence prolong the life span of the pistons. We have the capacity and experience to supply products for Mahle, KS Pistons, Toyota and Honda Companies, etc. We provide custom ALFIN rings to meet your specifications.