Designed to drill through wood and masonry walls for installing computer, security, phone, and cable wire systems, this Combination Drill Bit for Wood & Masonry from Jonard Tools eliminates the need to carry multiple drill bits with you, perfect for any installer. This drill bit features an aggressive tip that drills through wood, masonry, and other similar materials with ease. The 4" length provides extra stability and makes it easier to carry. The bit has a black oxide shaft and a blue powder coating for improved durability and rust resistance. The bit features a hexagonal shape that helps prevent it from spinning in your drill chuck.