I have been using this wire stripper for a while, but I have always wondered what was the purpose of those holes in the center and above LOOP, and those teeth on the handles.
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Used as pliers.
Strip 22-20 AWG (.8 mm) wire.
Strip 18 AWG (1.0 mm) wire.
Strip 16 AWG (1.3 mm) wire.
Strip 14 AWG (1.6 mm) wire.
Strip 12 AWG (2.0 mm) wire.
Strip 10 AWG (2.6 mm) wire.
Used to cut wires and cables.
The loop hole is used to bend hooks in wires, so that the wire can be attached to screw terminals. Place the tip of a stripped wire into the hole, and bend the wire around the body of the tool.
The other holes in the middle of the body, are screw/bolt shearing holes. They are used to cut small screws/bolts to length. To use them, simply thread the screw/bolt into the proper sized hole to the desired length, then squeeze the handles together. The screw/bolt will be trimmed, without damaging the threads.
This means that you can crimp insulated and non-insulated crimp terminals
This means the tool can crimp insulated and non-insulated 16-10 gauge crimp terminals. The colors below represent the color of the insulated crimp terminals, for quick reference.
This means the tool can crimp insulated and non-insulated 22-18 gauge crimp terminals. The colors below represent the color of the insulated crimp terminals, for quick reference.
This means the tool can crimp insulated 7-8mm auto ignition wires (spark plug wires).
The holes in the center are bolt cutters for metric bolts, the loop hole is to help you make loops in wire, see this link for an example of loop usage.