metal hit anchor is also known as hammer drive anchor, metal hit nail anchor. The body of the concrete metal hit anchor is a cylindrical non-rusting zinc alloy body, and the pin in it is a heavily zinc plated carbon steel pin or 304 stainless steel pin. There is a bore in the body, and it runs through the head thickness and stops in the point where the slot terminates in the shank. The anchor has rounded head. It's a precision die-cast, light-duty concrete anchor designed for anchoring into concrete, brick or block. It's available in two diameters-3/16" and 1/4". The nail pin should be together with the anchor.