Sigma Electric ProConnex 49663 NM/SE Clamp Type Connector 1-Inch, 1-Pack Terminates NM or SE Cables to a 1-in knockout For 10/3 - 4/3 NM Cable, 0.51-in x 0.80-in by 0.62-in x 0.98-in Oval SE or 0.69-in - 0.92-in Round SE Tri-combo screws included Zinc die-cast construction Product is UL and CSA listed Sigma Electric