The 51004-0300 is a 3-way 1-row MicroBlade? Wire-to-board Receptacle Housing made of polyester with friction lock. It mates with 53014, 53015 and 53025 MicroBlade? headers. The crimp housing is suitable for signal and wire-to-board applications. This 51004 series receptacle housing can be used with 50011 crimp terminal.