Yes, it matters which way the pins are inserted into the tool. The crimps are directional, meaning they have a small side for the wire and a larger side for crimping around the insulation.

These crimpers have an unlock feature that lets you reset the terminal if it moves before crimping all the way.

They are sized for crimping small connectors such as JST XH/PH, Molex Microfit 3.0, DuPont 0.1” pins, etc

It requires a fair squeeze to release, making the grip lock very functional and convenient, especially for momentarily pocketing the tool between crimps.

It's coated with lubricant to protect the tool, so be careful when removing it from the protective plastic bag.