the advantages of ZBF: raw Material, specified high quality GCr15Advanced digital turning, grinding machines and experienced workers guarantee the precision and quality. QC:workers do three and check one of them,according to the operation card attached on the machine. Automatic demagnetization,cleaning and anti-rust machine to ensure the cleanliness of the product . Quality Control:QC inspect 4times/day at random , 100%full inspection before assembling &shiped. Professional management system and team, tidy workshop environment.