... 9001:2000 approved 4.Customized drawings Aluminum Machined Parts features: 1.Material of precision machined parts: carbon steel, free cutting steel, ... brass, aluminium or stainless steel.2.Finish of precision machined parts: zinc plated(Cr3), smoothly oil, anodized, e- ... many years of experience in making aluminum machined parts, we are confident in our accurate tolerance control and stable quality.