The friction lock on the top surface provides a positive hold against the mating header, enough to keep the pair mated under moderate vibration in an automotive or industrial cabinet.
What mates with this housing
The 10-position count matches a 10-circuit header at the same 1.50 mm pitch; a 12-position header will not seat in this housing.
This is a housing-only part: you need the matching Molex Pico-Lock crimp terminal (female blade socket) for each circuit. The terminal, wire, and crimp tool are separate line items. Ordering the housing alone and expecting a wired assembly is the most common BOM miss on this series.
ROHS3 compliant per the current revision.