Product Description Power Pro 47877 Lag Screws, 5/16" x 4", Star Drive Construction Lag Screws, Rust Resistant, Ceramic Coated Bronze, 5lb Tub, 100 pcs From the Manufacturer This products has features that are both impressive and unique. Topping the list is the new "Star Drive" technology which virtually eliminates camout for a smooth, effortless drive every time. Chances for splitting wood are greatly reduced by the patented cross-cut threads and the wood biting cut point. These two features combine to prevent wood splitting by grinding wood and removing fibers from the hole.