... 3-20mm (max) Our advantages:l we are a direct manufacturer, and own metal working Equipment (l laser cutting machine, CNC ... to material: carbon steel, stainless steel, aluminum alloy, brass and bronze alloyl Extensive surface treatment experience :polishing ,zinc plating, ... :2008 CQC & CNAS 00110Q27049R1M/3302 Scope:Metal structures manufacturing and service 2010/08/05 --- 2013/08/04 Testing Report: ...