The Hillman Group 591017 Hex Lag Screw, 3/8 by 3-Inch, Zinc, 8-Pack

Hex Lag Screws are used for directly fastening into wood surfaces. They are used with a lag shield and lag screws can be used in masonry applications. The hex head is six-sided and ideal for easy driving and quick installation. The threads on lag bolts are designed to embed into the wood, rather than relying on a nut to secure the connection. The length of a lag screw is measured from the underhead bearing surface to the tip of the screw.