METRIC, 3/8” DRIVE, FLARE NUT, STANDARD LENGTH, CHROME HAND SOCKET. Flare nut sockets are specifically designed for Lambda probes, featuring an open section that facilitates easy use with wires and connectors. Input Drive Size: 3/8" Drive Shape: Square Length: 80mm Type: Flare Nut Socket Output Size: 18mm Opening: Flare Nut