CNC Plate Drilling Machine, CNC Drilling and Milling Machine, CNC 3-D Drilling Machine manufacturer / supplier in China, offering UL0816 UL0820 CNC U-Channel Punching and Marking Machine in 3 Sides for U-Channel, Channel #8, #16, Punching Force 700kN, Punching Diameter: 22mm, 18mm, UL0816 UL0820 CNC U-Channel Punching and Marking Machine in 3 Sides for U-Channel, Channel #8-#20, Punching Force 700kN, in Power Tower Steel Structure, UL0816 UL0820 CNC U-Channel Punching Machine in Three Sides, Channel #8, #16, Angle Size 5-100mm, Punching Force 700kN and so on.