TE Connectivity TERMI-BLOK 3.81mm Vertical Closed End HeadersTERMI-BLOK 3.81mm vertical closed end header terminal block connectors with polarization keying slots. These TERMI-BLOK 3.81mm closed end PCB header terminal block connectors are made from green polyamide 6.6 GFTE Connectivity TERMI-BLOK 3.81mm Two Part Terminal Blocks