These Crimp Hand Tools are Ratchet types with a Parallel action.
The YRS type Crimper, stock number 752-2273, is designed for SCN contacts in strip form.
The WC type Crimper, stock number 752-2279, is designed for SCN loose contacts.

2.5mm Board-In - JST SCN Connector

These JST Wire to Board Crimp style 2.5 mm pitch SCN Connectors are a Board-In type. The 2.5 mm pitch SCN Connectors provide high-density mounting in an efficient and economical manner.