Included with the box assembly are wire management ties and straps. The inner or small knock out gives a hole with a 1-3/16″ diameter. The outer or large knock out gives a hole with a 2 inch diameter.
At the bottom, the rectangular knock outs are 2-5/8″ x 1-5/16″. The two outlet module is sold separately as H1070. Or click here for a list of modules.