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.