INEXO® ICF Commercial Electrical Boxes (Double Gang) can be attached anywhere in an ICF wall using the patented "teeth" designed to bite into and firmly secure in place. The four teeth are pushed in and lock in place. Boxes positioned adjacent to a plastic tie can be secured using screws through the wide side mount flanges--simply remove the teeth on the fastened flange side and engage the teeth opposite. INEXO® Electrical Boxes for ICF are an industry favorite.