1.metal case: 2.made of steel sheet or AL sheet 2.competitive ... .high quality and best service 4. OEM service metal case : Product Type metal case Materialsteel sheet, Al sheetMachining typestamping, punching, bending, welding ... ,CNC-Turning machines,Milling machines,Precision wire cutting machines2)Material:Iron,carbon steel,stainless,brass,copper,alloy steel,aluminum,cold rolled ...