The Wej-It WDU38 drop-in anchor is an internally threaded anchor designed for use in solid masonry and uncracked concrete. It is made from zinc-plated carbon steel and meets GSA FFS-325 Group VIII Type 1 Federal Specifications. The anchor's body expands within the drilled hole to secure it in place, ensuring a flush anchoring of an object to the mounting surface. The anchor is available in various sizes, including 1/2-inch diameter and 1-5/8-inch length, with 3/8-16 threads. It is a reliable choice for applications requiring a secure hold within solid materials.