customized OEM Cast Iron With ISO 9001:2008 Standard and non-stan customized OEMCast Iron \Timing pulley Standard and non-standard. ... T20, 3M, 5M, 8M. Surface treatment: High frequency, black of oxidation, zincing, nickelage, anode. Machine: CNC engine lathe, milling machine, ... manufacturer and exporter of CNC machine parts in high precison according to drawing or sample in metal ...