The 39-01-3103 is a 10-position Plug Housing made of natural color nylon. The 5559 series Mini-Fit Jr.? dual row crimp housing is suitable for use with the 5558 Mini-Fit Jr.? male crimp terminals, 30490 Mini-Fit? male grounding crimp terminals and it mates with the 39-01-2100 receptacle housing. The positive locking prevents accidental unmating and the polarized mating geometry ensures header and receptacle cannot be mismated.