Hillman 1/4 in. D X 0 in. L Steel Round Head Setting Tool Drop-In Anchor is ideal for your project needs. Comes in a pack of 1, this steel round head setting tool drop-in anchor is for heavy-duty concrete materials like thin walls or prestressed concrete. The drop-in anchor is easy to fasten without a hassle, and with a setting tool, the process is easier. The steel construction is durable and will hold up long.