This 101-piece drill bit and screwdriver bit set is designed for drilling and fastening across wood, metal, masonry, and plastic. It includes assorted drill bits, screwdriver bits, nut drivers, a magnetic bit holder, a countersink drill, and a gauge in a compact carrying case. The drill bits are made from HSS or carbon steel, while the screwdriver bits use durable CR-V material for reliable performance. Clear labels and organized storage help keep every component easy to access and transport.