Sigma Electric ProConnex C-510 AC/MC/Flex Combination Connector 3/8-Inch, 100-Pack Terminates AC, MC, FMC and RWFMC to a 1/2-in knockout For aluminum or steel 14/2 - 10/3 AC or MC, and 3/8-in FMC Features tri-combo screw Zinc die-cast construction Product is UL and CSA listed