High Precision Engine Part 1.Material:Brass copper 2.Tolerance:0.01mm 3. ... Work SteelDF-2,XW-5, XW41, SKD11High Speed SteelHSP-41,ASP-23, A2, A6Martensitic SteelS136, S136H, 440CPrecipitation-Hardening17-4PHSpring SteelC1065, SUS301 ... , PEEK 1000, ESD225, ESD420 , ESD520HRCeramicZrO2, ESD CeramicCarbideCD 650 High Precision Engine Part