Outstanding lifespan in wood! The tapered spiral groove allows for drilling through hard materials without jamming. When drilling through multilayered building materials, you need durable drill bits that won't get stuck or stop when you hit a nail. With these drill bits, you can penetrate formwork and layers of metal sandwich panels. PRO Wood HSS installation drill bits are perfect for this task. They are an excellent choice for construction workers and installers who need to drill holes in various building materials such as metal sandwich panels and hardwood. Made from high-speed steel (HSS), they offer strength and heat resistance. The drill bits are long enough to penetrate multiple layers of building materials and feature a tapered groove that prevents jamming even in damp wood. They can be used for all formwork, interior construction, plumbing, and electrical installation work.