Hilti 1/4 in. x 1-5/8 in. Carbon Steel Zinc Plated KH-EZ 3/8 in. Internally Threaded Concrete Screw Anchors (100-Pieces) 423472 - The Home Depot

Hilti's line of carbon steel HIT Metal Drive Anchors are tough and reliable for your light duty anchoring projects. These HIT Metal Drive Anchors are excellent for jobs where speed and ease of fastening are important. The Anchors design allows for easy through-type fastenings even in bottomless holes. The low profile mushroom head style provides a nice finish and tamper proof fastening. Choose the Anchors that is consistent and reliable for all of your light duty concrete and masonry fastening projects: the Hilti HIT Metal Drive Anchor