The Bremick Hex Head Screws are used for joining metal to metal which usually requires greater strength and torque input. This type of hex head screw is ideal for when a watertight fastening is required and the addition of Top Grip technology makes it great for roofing. These screws feature a drill point tip, meaning they can drill a starting hole so the threads of the screw can cut into the material, securing it into place. Its B8 coating makes it so that you can rest easy and that these screws will last a long time securing your projects. B8 coating is a hard, highly abrasion and extremely scratch resistant alloy, which is eight times more durable than conventional, soft and friable, zinc and galvanised coatings. For metals B8 coated for longer lasting rust protection vs galvanising and zinc plating Hex head with seal Drill point Great for fastening metals in corrosive areas Ideal for fastening work that requires watertight seals