Answer: 6/32, 8/32, and 10/32 are the most commonly used electrician's screw drill and tap sizes in electrical boxes installed in the USA. NOTE: Some text links below go to applicable products on Amazon. As an Amazon Associate, I earn from qualifying purchases. Power tools are heavily used to install distribution box units, with drills and impact drivers being especially common. The table below highlights the most commonly used power tools when you install distribution box setups: When you install distribution box. Flexible Installer Drill Bit for Pulling Wires Through Walls Ceilings and Sidewalks, 54-Inch Long, 3/4-Inch Auger with a Fish Eye Hole and Screw Point, 1/4" 3-Flat Anti-Slip Shank. DECKRKAT 54" Flexible Installer Drill Bit - 3/8" Auger with Fish Eye Hole & Anti-Slip 3-Flat Shank for Wire Pulling. Installing floor switch box with Worktool square drilling bit Worktool square drilling bit makes installation faster and more precise The Worktool square drilling bit is designed to create accurate square holes in concrete or brick surfaces, making it ideal for installing electrical switch boxes. Standard drill bits are the most commonly used drill bits for electrical wiring. When drilling holes for electrical wiring, it is important to choose the appropriate drill bit size based on the size of the wire. The integration of an electrical flush-mounted box is an essential step for any modern electrical installation, allowing cables to be secured and concealed in the wall for an aesthetic and tidy look.