A fastener includes a shank having a first end and a second end. The fastener includes a first thread region adjacent to the first end having a first helical thread and a second helical thread interposed with the first helical thread in the first thread region. A second thread region is provided adjacent to the first thread region, the second thread region including only the second helical thread with the second helical thread having a diameter greater than a diameter of the first helical thread. A third thread region having a third helical thread is provided extending from the second thread region toward the second end. A head is provided on the second end and includes a disk and an octagonal boss between the disk and the third thread region, the boss including four major sides extending perpendicular to the disk and four chamfered sides, the chamfered sides being flush with a side edge of the disk.