A Truss head screw has a head with flat underside and a slightly domed top. It has almost no exposed edge. Sheet Metal Screws have deep spiral threads the entire length and with a pointed end. Holds thin metal sheets togethe...

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A Truss head screw has a head with flat underside and a slightly domed top. It has almost no exposed edge. Sheet Metal Screws have deep spiral threads the entire length and with a pointed end. Holds thin metal sheets together. Holds well in wood, Plastic, and Fiberglass. Manufactured from metal. Can be rotated into or out of the object using a screwdriver