3/8" NM Cable Connector - Zinc Die Cast - 3/8" NM Cable Connector for Terminating NM Cable To a Steel Box.3/8" NM Cable Connectors features include: Used to connect Non-Metallic Sheath Cable and Flexible Cord from .30” to .45” in diameter to Outlet Boxes, Enclosures, or Raceway Systems Assembled with Zinc Die Cast Locknut and Combo Screws 3/8" NM Cable Connector fits 1/2" Knockout cULus Listed Order Qty of 1 = 1 Piece Below is more info on our 3/8" Zinc Die Cast NM Cable Connectors