... 1.Name: metal machining brass filter cartridge 2.Material : brass, SUS3163.Process: stamping, machining,assembling, CNC machining, thread machining, mirror polishing4.Tolerance ... , turning, planning, grinding machinery and three-axle machining centers.Test Equipments:Hardness tester,Chemical analysis,Digital Measuring ... a friendly & long cooperated relationship. metal machining brass filter cartridge