Major Tech KDKP01 Punchdown Tool Punchdown and insertion tool for Krone style blocks Automatically inserts and trims wire in one action Datacom tool To use the punch down tool, a wire is prepositioned into a slotted post and then the punch down tool is pressed down on top of the wire, over the post. Once the required pressure is reached, the internal spring is triggered, and the blade pushes the wire into the slot, cutting the insulation, securing the wire.