ProFIT 0093172 Square Cut Nail, Concrete Cut Nails, 10D, 3 in L, Steel, Brite, Rectangular Head, Tapered Shank, 50 lbMasonry nails are hardened nails designed to be driven into concrete or the mortar used to hold together bricks or cement blocks. This rigidity also lends masonry nails to a wide variety of installations ranging from attaching plywood subfloor to securing carpet tack strips. Unit: POUND UPC: 718928707474 Model Number: 0093172