These Hex Lag Screws are hexagonal drive screws used for directly fastening into wood. Common applications include retaining walls, deck frames, and outdoor play equipment. When used in conjunction with a lag shield, Lag Screws can also be used in masonry applications. Use in pre-drilled hole. The length of a lag screw is measured from the underside of the head to the pointed tip of the screw. Available in various materials and finishes to suit your specific application.