1lb 2-3/4" masonry nail. 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. 2-3/4" length, 70 per pound, 1 lb.