The Hillman Group 832046 5/16 x 4-Inch Stainless Steel Hex Lag Screw, 25-Pack Product Description 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 screws are designed to embed into the wood, rather than relying on a nut to secure the connection. From the Manufacturer 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 screws are designed to embed into the wood, rather than relying on a nut to secure the connection. Features The Length Of A Lag Screw Is Measured From The Dunderhead Bearing Surface To The Tip Of The Screw Hex Head Is Easily Driven With Simple Wrenches And Requires Minimal Clearance Above The Fastener Stainless Steel From The Brand Name: The Hillman Group USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.