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Product feature: 1. Equipped with three drilling head, which can provide high efficient drilling capacity with wide range of hole diameters. All these 3 drilling units can work simultaneously on the web and flanges of the beam.   2. Three drilling head can drill holes simultaneously, and adopt self-controlled stroke drilling head. No need to set thickness of work piece and length of drilling, automatically finish the transfer of rapid feeding and work feeding, and with high efficiency.3. CNC Controlled marking unit being equipped on the unloading roller to mark pre-programmed numbers/character