1. Material: lead, brass 2. Grade: HPb59-1 / C37800 / C3710 3. Content: 59% copper ("H") and 1.8% lead ("Pb") Thermal conductivity: (at 20 ° C) 104.67 w / m. ° C Hardness: Rockwell hardness HRB 44 (soft): 80 (hard) 4.Precise chamfer cutting, precise aperture 5.CNC precision machining, round inner wall without burr 6.Sampling inspection during the production process to ensure the accuracy of the hole diameter 7. ISO9001: 2015 quality management system, Rosh test report, ISO16949 production management system (expected to complete audit in September 2020) 8. Complete and strict QC, IQC, IPQC 9. Inventory system to ensure delivery 10. Multiple modes of transportation to ensure transportation safety and timeliness