Unique design, the Libero-ARC ‘s angled head shape provides several benefits. First is controlled driving. By directing the energy from the hammer through the center of the nail allows this long slim nail to drive true and as high as you like. Secondly, the crown can swell slightly when setting the nail to provide maximum tight nail fit prior to clinching. Thirdly, by reducing the outside angle of the head, you can initiate and maintain nail pitch.