Power Pro LumberTite structural wood screws are general purpose, heavy duty fasteners designed for wood to wood construction without pre-drilling, indoors and outdoors. They have a star drive and a low profile wafer head, so no washer is needed, and a diamond shank that reduces drive torque. A depth code on the head allows quick post-inspection. This item is a single 1/4 in. x 4-1/2 in. screw, black 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.