Power Pro TrussTite structural wood screws are designed to join engineered lumber together (LVL, PSL and LSL), which is typically done with through bolts or by nailing or screwing on both sides. They have a hex head with a built-in washer colored red for easy post-inspection identification. This item is a single 5/16 in. x 3-3/8 in. screw, red epoxy coated, individually flagged for sale as one screw. No driver bit is included. The Power Pro structural line installs up to 30% faster than the competition with no pre-drilling, has Grade 5 strength and higher pullout values, and is AC257 treated lumber certified and ESR-4017 wood-to-wood connection certified.