The Hillman Group 370191 Mini Lag Shield, 5/16-Inch Short, 50-Pack Product Description Provides secure anchorage of lag screws in concrete and the mortar joints of block and brick. Short lengths may be used to shorten drilling time. Four way expansion insures a tight grip and prevents over expansion. No lubrication is required. From the Manufacturer Provides secure anchorage of lag screws in concrete and the mortar joints of block and brick. Short lengths may be used to shorten drilling time. Four way expansion insures a tight grip and prevents over expansion. No lubrication is required. Features Short Lag Shield Anchors May Be Used In Hard Masonry To Help Reduce Drilling Time Pre-Drilling Required Unique Four-Way Expansion That Assures A Tight Grip In The Hole, Yet Prevents Over-Expanding 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.