The black UL94 V-0 rated insulator stands 0.100" off the board.
The 0.100" (2.54mm) pitch is the de facto standard for breadboard and perfboard compatibility — this header drops into a standard 0.1" grid without footprint modification. The 0.900" mating contact length gives you room for a receptacle with a deep cavity or for stacking two boards with a significant z-height gap.
