IVY Classic 46420 5/16-Inch x 18-Inch Bell Hanger Installer Drill Bit, High-Speed Steel, 82-Degree Point, 1/Pouch For installing telephone, cable TV, computer and security wires, Swift Bore (Registered Trademark) 82-degree point for fast boring through wood, plaster and metal lath Hole in flute for pulling wires through walls, ceilings and floors Heat-treated and tempered high-speed steel Diameter: 5/16-Inch, Overall Length: 18-Inch