Metal: Carbon steel GB/T-709 Q345 Thickness: 25-28mm Quantity：100pcs Metal Fabrication Processes: Plasma cutting, Welding, Machining Application：Not to disclose Features： 1 Welding between twice machining; 2 Surface flatness to be high; 3 Front side and backside to be highly parallel 4 Hole for the tube to go through to be in the precise position and tight tolerance.