Blue-Kote™ screws feature three anti-corrosion layers, making them the ideal choice for a wide variety of indoor and outdoor projects. Blue-Kote screws provide rust resistance up to 400% greater than zinc-plated screws and work with pressure-treated material. Features 3 anti-corrosion layers, allowing them to be used for indoor and outdoor applications. Coarse-Thread for use with Soft/Plywoods