Hillman 1/2 in. D X 0 in. L Steel Round Head Setting Tool Drop-In Anchor is perfect for any of your line-up projects. Use this drop-in anchor in heavy-duty concrete materials, thin walls, or pre-stressed concrete. With a roundhead setting, the installation is quick and easy. The drop-in anchor is made durable with steel for a secure grip, and it comes in 1-pack, ideal for your project needs.