Ventilation Corner , L bar , Duct corner 1.mild steel,sst,Al.etc 2.Press ... type:6ton-200ton 3.ISO9001-2008 Ventilation Corner , L bar , Duct corner (ISO9001-2008) 1. Material: iron, carbon steel, stainless ... ,CNC lathes, milling drilling,grinding etc5. Surface treatment: Zinc plated,power coated,chrome plated,hot-dip galvanized or others6. Packing: wooden case, pallet ...