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#4 Flat head phillips drive self tapping screws made of stainless steel. Sometimes called sheet metal screws or self tappers, these fasteners are common for home repairs as well as installing hardware on your boat. Flat Head is the most common screw head type, and is used for general fastening when the screw head will be flush with the surface, or when it will be countersunk and the hole will be plugged. Phillips drive allows greater torque to be applied when fastening.