Outstanding durability in wood! The tapered spiral groove allows for drilling through hard materials without jamming. When drilling through multilayer building materials, you need durable bits that won't get stuck or stop when hitting 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 like metal sandwich panels and hardwood. The bits are made from high-speed steel (HSS) to ensure strength and heat resistance. They are long enough to penetrate multiple layers of building material and 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.