770166-1 is a 2-circuit in-line vertical pin header with drain holes designed for use with Mini-Universal MATE-N-LOK and Mini-Universal MATE-N-LOK 2 connector systems. This header features a duplex plating finish and an A dimension of 0.387 inches (9.83 mm). The vertical pin header is designed for PCB board mounting and mates with plug housings using socket contacts, including part numbers 172165-1 and 794184-1. This connector is part of the AMP Soft Shell Pin and Socket Connector family and is RoHS compliant, making it suitable for various electronic interconnect applications requiring reliable wire-to-board connections.