Designed to drill through wood and masonry walls for installing computer, security, phone, and cable small wire systems, this combination bellhanger drill bit eliminates the need to carry multiple drill bits with you, perfect for any installer. This bellhanger drill bit also features the following Aggressive tip drills through wood, masonry, and other similar materials with ease Holes on the bit head and chuck allow for pulling of wires after drilling 18" length for even greater reach than standard drill bits Black oxide coated shaft and powder coated blue for greater rigidity, durability, and rust resistance.