The off-center conduit threaded opening of the Square D 2 1/2 in. Bolt-On Hub, along with its elongated mounting holes, reduces the need for costly conduit offsets and bends while allowing for easy and quick adjustments. The Square D 3 in. Hub is for use in Square D load centers, CSED devices and safety switches. This hub is a Type B size and is UL- and CSA safety listed.