3/8" Non-Metallic Twin-Screw Cable Clamp Connector (4 pcs). To connect sheathed cable / wire to small knockout provisions common on light fixtures, electrical boxes, equipment and other industrial / residential applications. Cable "tube" is approximately 3/8" inside diameter, connector threading is approximately 1/2" outside diameter. Nonmetallic diecast zinc, screws and nut are metallic. Bulk stock item without retail packaging.