175 Pack, 5/16" x 2-1/2", Construction Lag Screws, Perfect For Your Next Outdoor Project, Common Applications Include Decks, Stairs & Playsets, Features That Are Both Eliminates Cam- Cut 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 Two Features Combine To Prevent Wood Splitting By Grinding Wood & Removing Fibers From The Hole, Use With Treated Lumber.