Sigma Electric ProConnex 49503 AC/MC/NM Saddle Connector 3/8-Inch, 1-Pack Terminates AC, MC and NM to a 1/2-in knockout For aluminum or steel 14/2 - 10/3 AC, MC and 12/2 - 10/3 NM cable Features tri-combo screw Zinc die-cast construction Product is cULus listed