Power Pro structural lag screws are heavy duty wood screws that require no pre-drilling and can replace standard hex lag screws. They are a general purpose structural fastener designed for wood-to-wood construction and suit a variety of indoor and outdoor projects. The screw has a star drive and a low-profile head. This item is a full box of 75 screws in a 1/4 in. x 1-1/2 in. size, bronze epoxy coated, with a T25 drive. 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.