150 pack, 5/16" x 3", construction lag screws, perfect for your next outdoor project, features that are both impressive & unique, topping the list is the new "star drive" technology which virtually eliminates cam-out for a smooth, effortless drive every time, chances for splitting wood are greatly reduced by the patented cross cut threads & the wood biting cut point, these 2 features combine to prevent wood splitting by grinding wood & removing fibers from the hole, use with treated lumber.