High Speed CNC Plate Punching and Drilling Machine with Marking Function Hole Diameter 50mm. Applicable industry: Used for punch, drill and mark of joint plate in the field of iron tower. It is also used to punch, drill and mark of metal plate of other trade. Product feature: 1.heavy duty 3 hole puncher , plastic bag hole puncher , sheet metal hole puncher , hole puncher for paper , pvc card hole puncher , hole puncher for fabric , id card hole puncher , small hole edm machine , paper hole punch machine , horizontal deep hole drilling machine , single hole punching machine , deep hole boring machine , paper hole ...What is Functional Hydraulic CNC Plate Punching Automatic Machine Plate Drilling Machine, cnc plate punching machine manufacturers & suppliers on Video Channel of .Through-hole or thru-hole varieties are connected via a drilled hole on the printed circuit boards, with soldering applied to pads on the reverse side. Conversely, surface mounted types are designed to attach directly onto the surface of the board. Locking Push Button Switches. Locking push button switches feature a mechanical locking function.