These Masonry Cut Nails are hardened for nailing into masonry. Heat-treating cut nails and are ideal for nailing furring strips to cinder block, mortar joints, new concrete, and other brick walls. Also used for face-nailing hardwood flooring. Available Hardened in Standard Finish only. Available in 50 lbs., 5 lbs. and 1 lb. options. Refer to each product page for approximate nails per pound.