The ratchet on these tools applies the right amount of pressure to make sure the crimp is complete every time. Since you insert the wire ferrule from the front, they're useful in tight spaces.

Insert wire ferrules from the front to crimp in tight spots.

The ratchet applies the correct pressure to ensure a complete crimp every time on pin-and-sleeve contacts.

The ratchet applies the correct pressure to ensure a complete crimp every time.

The insulated handles on these crimpers protect against shock from accidental contact with live electrical circuits.

They may look like normal pliers, but these tools have a built-in crimping die.