Product Description 50 Pack, 3-3/8", Trusstite Screws, Ideal For The Connection Of Lightweight Steel Framing, Into A Pre-Drilled Or Pre-Punched Hole, Used For The Assembly Of Steel Roof Trusses. From the Manufacturer TrussTite Screws are unique fasteners specifically designed to join engineered structural lumber together such as parallel lumber, laminated strand lumber, and veneer lumber. Typically these are joined with through bolts or nailin. Recommended for use with ACQ and other forms of treated lumber.