The 0.300" (7.62mm) row spacing and the polarizing key mean it only mates with the matching D-3200 receptacle that has the complementary keyway, so you won't jam the wrong half together on the line.
The listing says it plain: Contacts Not Included. The crimp terminals are what actually carry the current; the housing just holds them in the right grid and provides the keying and panel-mount flange. If you're filling a BOM line, make sure the terminal part number is on the same order or you'll have a housing with nothing to stuff into it.
This plug mates with the Dynamic D-3200 receptacle housing that has the matching 0.200" (5.08mm) pitch and 0.300" (7.62mm) row spacing — the polarizing key on this plug aligns with the key slot on the receptacle so the connector only goes together one way. The panel-mount feature lets you bolt the housing to a chassis or bulkhead before you mate the cable side, which is handy when the harness needs to stay put during service. The crimp termination means you can field-repair individual circuits without scrapping the whole connector.