Outstanding lifespan in wood! Tapered spiral groove for drilling through hard materials without jamming. When drilling through multi-layered building materials, you need durable bits that won’t block or stop when you hit a nail. With these bits, you can drill through formwork and layers of metal sandwich panels. PRO Wood HSS installation bits are just right for this task. They are a great choice for construction workers and installers who need to drill holes in various building materials such as metal sandwich panels and hardwood. They are made from high-speed steel (HSS) to ensure strength and heat resistance. The bits are long enough to penetrate multiple layers of building material. They feature a tapered groove that prevents jamming even in damp wood. You can use them for all formwork, interior construction, plumbing, and electrical installation work.