Outstanding lifespan in wood! Tapered spiral groove for drilling through hard materials without jamming. When drilling through multilayer 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 perfect 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.