Abstract: An anchor nail comprises a nail body being cut from a metal sheet and folded into shape. The nail body has an anchor strip substantial cut from a central portion of the nail body, whereby the nail body can be stricken to pierce the work pieces together with the anchor strip by striking the striking head of the nail body, so that the striking head can be in flush with an outer surface of the work pieces whereas the striking section of the anchor strip can extend out of the outer surface of the work pieces. Thereafter, the anchor strip can be stricken to move into the work pieces to be in flush with the striking head of the nail body so that the slightly curved section can be further curved so as to anchor the work pieces. The anchor nail can enhance the combining strength of the work pieces.

Abstract: A nail strip is composed of a plurality of U-shaped nails or staples lined up along a line-up axis and bonded to each other in a side-by-side and detachable manner. Each staple includes a crown and two legs extending from opposite ends of the crown. The staples are oriented to have the crowns forming a serration configuration and the legs inclined with respect to the line-up axis so that when the staples are applied to a work piece the legs of the staples are forced into the work piece by following the inclination thereof to allow the staples to be applied to an edge of a work piece in a corner thereby enhancing the bonding force of the work piece at the edge.