SN-28B Dupont Crimping Tool for 3.96mm, 2.54mm, 2.5mm Pitch Dupont, JST XH VH Connectors, AWG 18 to 28

It crimps both the wire insulation and the wire simultaneously, so you don't need to crimp them twice, making the process very convenient.

You can first loosen both screws, then swap the dies, crimp to seat them properly, and finally tighten the screws.

The dies are unmarked. Detailed instructions can be found in the online manual.

It creates great connections to JST, Molex and Dupont connectors.

The tool comes pre-calibrated. After long-term use, you can do the pull test - if the connector easily slides off, increase the tension; if the insulation is visibly over-tightened (looking like it's oozing through the gaps of the connector), then decrease the tension.