SPAX T-STAR plus Flat Head fasteners with yellow zinc coating are designed for use in multiple material connections often found inside residential domains. These construction fasteners are designed to countersink in lumber for a clean-flush finish and provides a quick and easy installation. In addition, they provide long-lasting, "contractor proven" secure connections. Whether you're working with wood, concrete, masonry, sheet metal, or plastic, use SPAX Multi-Purpose Construction Screws on multiple materials.