1. Lighter than Rigid Metal Conduit but as strong as RMC 2. Both inside and outside of conduit are galvanized.

IMC CONDUIT-(Intermediate Metal Conduit) UL 1242-1983 Size Outside Diameter Wall thickness Length 1/2" 20.7mm 1.78mm 10ft 3/4" 26.1mm 1.91mm 10ft 1" 2.80mm 2.16mm 10ft 1-1/4" 41.60mm 2.16mm 10ft 1-1/2" 47.80mm 2.29mm 10ft 2" 59.90mm 2.41mm 10ft 2-1/2" 72.60mm 3.56mm 10ft 3" 88.30mm 3.56mm 10ft 4" 113.30mm 3.56mm 10ft

IMC conduit