... group of 4 -- 6 layereach layer had 2 cross beam and 2 metal panel or plywood, can also according to ... :Cold rolling steel SPCC DC01,ST12,Q195l 2,Beam adjustment:The beam levels are adjustable l 3. Procedure: Moulding+ Acid cleaning ... more professional 8. Best quality material ,high standard workmanshipand safe during transportation 9.Thickness of steel sheet, color, dimension, structure and handles ...