The 4.50 mm pitch suits power distribution and larger-gauge wiring.
You'll need to order the YL-series crimp terminals separately, typically the male pin contacts that insert into the housing cavities. The crimp termination means you can terminate wires in the harness shop and then stuff the contacts into the housing, which is standard practice for field-serviceable or batch-built cable assemblies. The PA66 housing is rated for -25°C to 90°C operating, so the assembly stays within spec for indoor equipment and moderate industrial environments.