About Hex Head Lag Screws The lag screws are heavy-duty fasteners.They are driven by a wrench and are mainly used for fastening to masonry or wooden frames. Insert the anchor into the hole drilled in the masonry, and then screw the lag screw firmly into the anchor. They are commonly used for greater work and greater retention. High Quality Material Our lag screws are made of 304 stainless steel which provide great strength and good corrosion resistance to make fasteners last! That make the lage screws are suitable for Indoor & Outdoor uses. Exterior Finish With special black treatments, the screws made of the finest 100% 304 stainless steel shows better corrosion resistance than 304 stainless steel screws without coating outside . Come to RoyceMart and find different thread sizes (1/4", 5/16", 3/8", 1/2") and lengths ranging from 1" to 6". The screws are manufactured under tight tolerance, ensuring precision and uniformity in production.