2.0 mm Pitch, 7 Circuits, Open-Key EMI Shield
The 505575-0771: This is a Molex 2.0 mm pitch SMT plug header, 7 circuits, in a black housing with an open-key EMI shield — the shield is a stamped metal cover that wraps the mating face to contain radiated noise, and the open keyway means the housing accepts a mating receptacle with a corresponding polarisation rib. On a dense board, that pitch keeps the routing channels open between pads.