Sigma Electric ProConnex 44655 Snap Lock NM/SE Connector 3/8-Inch, 2-Pack Terminates NM Cable or Flexible Cord to a 1/2-in knockout Faster installation with no locknut required For 14/2 - 10/3 NM cable or .29-in Flexible cord (diameter) Zinc die-cast construction Product is cULus listed Sigma Electric