Punch down tool

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A punch down tool with interchangeable blades

A punch down tool, also called a punchdown tool or a krone tool (named after the KRONE LSA-PLUS connector), is a small hand tool used by telecommunication and network technicians. It is used for inserting wire into insulation-displacement connectors on punch down blocks, patch panels, keystone modules, and surface mount boxes (also known as biscuit jacks).

Most punch down tools are of the impact type, consisting of a handle, an internal spring mechanism, and a removable slotted blade. To use the punch down tool, a wire is pre-positioned 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, and securing the wire.[1][2] Note that is is not the tool that cuts the insulation, but rather the sharp edges of the contact slot itself. For light-duty use, there are also less expensive punch down tools with fixed blades and no impact mechanism.

To accommodate different connector types, 66, 110, BIX and krone require different blades. Removable blades for 66 or 110 are almost always double-ended. Some blades have one end that only inserts the wire for daisy-chain wiring from post to post and another end that inserts wire and trims the excess length for termination at a post. Other blades have a cutting 66 blade on one end and a cutting 110 blade on the other.[3] The trimming blade cutting edge works against the plastic insulating post. Krone blades require a separate scissor-like mechanism for trimming the wire.