This burndy tool has the possibility to hold a variety of Die's.
In the company I work for we use this tool primarily for crimping fire detection wire terminals in the hot section of the CFM-56.
On the 737ng fire detector wiring we use heavy duty high temperature resistant terminals or more specifically, YAV14G88 terminals.
The fire detector wire has a protective insulation wich is difficult to strip with standard wire stripping cutting blades so we use the fire detector wire strippers

For this example we will use the BMS13-55 Type 2 Class 1 Gauge 18.
The BMS 13-55 type 2 classifies the type of wire. In this case fire detector wire with protective isolating material.
The Class 1 indicates that there is one conductor in the wire and the Gauge 18 represents the thickness of the conductor.

Boeing advises to use the right wirestripper for the right wire, if we were to use a standard wirestripper on this type of wire the results are terrible.

The blades can't properly cut the insulation and the holding blocks are trying to forcefully pull the wire back to strip off the insulation leaving the wire like this.

This is why we use the fire detector wire stripper. The fire detector wire stripper cuts through the protective insulation.

U can see the knife like blades cut through the insulation but don't cut the conductor.

The YAV14G88 terminal should be crimped so that the crimp barrel grips firmly onto the conductor and the flanges should grip the insulation creating vibration and strain relief.

With the wire inserted, a piece of the conductor should still be visible outside the hole onto the terminal lug.
This wire has been stripped to the minimum strip length allowed in accordance with boeing's Standard Wire Practices Manual (SWPM).

Now let's look at the crimptool. We use a Burndy M8ND basic tool with a N14HT die set on it.

When we rotate the crimptool head we can read wich cavity to use.

The terminal should be inserted so that the indent is made on top of the crimp barrel and the flanges on the back of the terminal are in the rounding section to squeeze em together to grip the wire insulation.

The wire is now inserted.

The handles are squeezed and the crimp is made. Note that the flanges now form a single round 'clamp' around the insulation.

Then we inspect the crimp.

The YAV14G88, crimped onto the BMS13-55T02C01G018 wire.