Fsct Shallow Depth 1-Gang Cast Device Box | Designed to Compensate for Length Changes Due to Temperature Variations in Exposed Conduit Runs | For Limited Space Applications | For Use With Emt Conduit | For Use With Threaded Metal Conduit and Imc | Hex-Key Ends Are Square-Cut for a Secure Full-Depth Fit and Maximum Contact With the Hex Socket to Prevent Slippage and Stripping of the Socket | To Connect Threaded Metal Conduit to a Threadless Opening in a Box or EnclosureFurbay Electric Supp