... ISO 9001:2008 Standard and non-standard customized OEMSteel Precision Casting/Mining PartsTiming pulley Standard and non-standard. ... frequency, black of oxidation, zincing, nickelage, anode. Machine: CNC engine lathe, milling machine, drilling machine, gear shaper, hobbing ... transportation or as requiredProfessional manufacturer and exporter of CNC machine parts in high precison according to drawing ...