Perfect for larger installations, this 42" enclosure features universal On-Q style mounting holes that are compatible with all bay-style modules. It also includes larger top openings that make pulling wire easier as well as additional knockouts, more side lances, and side tabs for more flexible mounting.Perfect for larger installations, this 42" enclosure features universal On-Q style mounting holes that are compatible with all bay-style modules. It also includes larger top openings that make pulling wire easier as well as additional knockouts, more side lances, and side tabs for more flexible mounting.