Sigma's Anti-Short Bushings are inserted to protect the conductors from the sharp edges of the raceway where cut. These #4 (3/4-in) bushings are made of plastic and are compatible with AC and FMC.
Protects wire against sharp edges of AC and FMC
For aluminum or steel 8/4, 6/4, 6/3, 6/2, 4/3 and 4/2 AC cable and 3/4-in FMC
Actual #4 trade size is equivalent to 3/4-in
Plastic construction