... and non-standard customized OEMSteel Precision Casting/Mining PartsTiming pulley Standard and non-standard. Material: Carbon Steel, Aluminum. Type: MXL, XL, L ... .5, T5, T10, T20, 3M, 5M, 8M. Surface treatment: High frequency, black of oxidation, zincing, nickelage, anode. Machine: CNC engine lathe, milling machine ...