Hillman 1/4 In. x 2-1/4 In. Slotted Hex Washer Tapper Concrete Screw (15 Ct.)
For all masonry materials. Specially hardened high-low thread actually cuts thread into masonry materials. A simple 2-step operation, drill then drive. Tappers may be removed and re-inserted in the same hole. Clamshell packaging.