Sigma Electric ProConnex 18051 NM/SE Clamp Type Connector 3/8-Inch, 4-Pack Terminates NM Cable or Flexible Cord to a 1/2-in knockout For 14/2 - 10/3 NM Cable or .29-in - .45-in Flexible Cord Tri-combo screws included Zinc die-cast construction Product is UL and CSA listed Sigma Electric