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. No. H52S125: 3/4" length; 230 per pound, 1 lb. No. H52S530: 3/4" length; 230 per pound, 5 lb. No. H53S125: 1" length; 176 per pound, 1 lb. No. H53S530: 1" length, 176 per pound, 5 lb. No. H54S125: 1-1/4" length, 150 per pound, 1 lb. No. H54S530: 1-1/4" length, 150 per pound, 5 lb. No. H55S125: 1-1/2" length, 129 per pound, 1 lb. No. H55S530: 1-1/2" length, 129 per pound, 5 lb. No. H56S125: 1-3/4" length, 108 per pound, 1 lb. No. H56S530: 1-3/4" length, 108 per pound, 5 lb. No. H57S125: 2" length, 95 per pound, 1 lb. No. H57S530: 2" length, 95 per pound, 5 lb. No. H58S125: 2-1/4" length, 85 per pound, 1 lb. No. H59S125: 2-1/2" length, 77 per pound, 1 lb. No. H59S530: 2-1/2" length, 77 per pound, 5 lb. No. H59S050: 2-1/2" length, 77 per pound, 50 lb. No. H60S125: 2-3/4" length, 70 per pound, 1 lb. No. H61S125: 3" length, 62 per pound, 1 lb. No. H61S530: 3" length, 62 per pound, 5 lb. No. H61S050: 3" length, 62 per pound, 50 lb.