100 pack, 5/16" x 4", construction lag screws, perfect for your next outdoor project, common applications include decks, stairs & playsets, 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.