FeaturesScrew style anchor designed for lag boltsBest used on mortar joints of block or brick wallsShort style preferred for harder masonryA two-piece assembly made of two semi-cylindrical hollow sections interlocked at the top, allowing the shield to expand when in placeThe bore of the shield is tapered, has an internal thread and has a ribbed outer surface to resist backing out5/16 in screwCan be used in solid or hollow base materials and is more resistant to temperature fluctuations and rust than other light duty anchors