For fastening furring strips, floor plates, and partition walls. Fluted shank. Hardened steel. For best results drive nails 3" or more from edge of masonry or block allowing 3/4" penetration. Safety glasses recommended when driving hardened nails. 5/16" head. 9-gauge. Size: 2d Length: 1 In. Finish: Bright Diameter: 9 ga Head Diameter: 5/16 In. Shank Type: Fluted Head Type: Flat Point Type: Diamond Package Size: 5 Lb.