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Kreg Blue-Kote ™ Pocket Hole Screws feature a three layer high-grade anti-corrosion coating. The first layer is a zinc layer to protect the hardened steel inner screw from corrosive environments. The second layer inactivates the zinc and creates adhesion between the base coat and the Blue-Kote layer. The Blue-Kote layer is a baked ceramic which is electrically/chemically inert, so rust can’t form on the surface. Enough of all that chemical talk, the gist is that the Blue-Kote screws are 400% more weather resistant than the “old” Kreg Sun-Seal screws and they still have our favorite Square Drive recess for positive bit engagement.