Punch down tool, A typical punch down tool with spring mechanism for impact cutting of wire. Built in hook for pulling wires, and flat tip screwdriver. Punch down tools, also known as a krone tool, is a hand tool used to connect telecommunications and network wires to a patch panel, punch down block, keystone module, or surface mount box. The punch down part of the name comes from punching a wire into place using and impact action. When the punch down tool connects a wire the the blade cuts off the excess wire during the punch down.