An externally threaded, hardened screw with a double lead, consisting of alternating raised and lowered threads with notches cut into the raised threads, and a diamond shaped, nail type point. Cuts its own threads and when used in concrete, block, or brick, eliminates the need for an anchor. Sold with a drill bit.

An externally threaded, hardened screw with a double lead, consisting of alternating raised and lowered threads with notches cut into the raised threads, and a diamond shaped, nail type point. Cuts its own threads and when used in concrete, block, or brick, eliminates the need for an anchor. Sold with a drill bit.