For indoor use. Fine-thread for use with hardwoods. Maxi-Loc screws are an ideal choice for a variety of applications. These screws have a large head that provides maximum bearing surface as the screw pulls tight in the pocket. The preferred choice for hardwoods that are hard and dense. These threads are less aggressive, so they’ll drive without splitting, but these screws have a higher number of threads per inch to ensure great holding power. For use on Oak, Cherry, Maple, Poplar, Walnut, Birch, Ash, Hickory, and Mahogany.Kreg zinc screws are a good choice for a wide variety of indoor projects with limited exposure to the elements.