1", Clamp Type Connector, Twin Screw, Die Cast Zinc, Use To Teminate Type Non Metallic Sheathed Cable To A Knockout In A Dry Location Box Or Enclosure, Fits Service Entrance Cable 6-3, 4-3, 4-2, 2-2, Non-Metallic Cable: 12-3, 12-4, 10-3, 10-4, 8-3, 8-2, 6-2, 4-2.