Easy Remodel: The round electrical box features built-in clamps for quick and secure mounting within existing ceilings, no extra tools needed Roomy Design: Our old work ceiling box is 2.67 inches deep with a 18 cubic inch capacity Versatile Use: The deep configuration of this ceiling electrical box makes it ideal for a variety of ceiling lights Sturdy Build: The round electrical box is constructed from high-quality, durable PVC, tailored for non-metallic sheathed cables, featuring non-conductive insulation UL Certified: All of CycevSun's electrical boxes are fireproof for up to 2 hours, meeting and certified by UL tests to comply with national standards and safety requirements