Hillman Tapper Concrete Screw

Designed to fasten objects into concrete, brick and block. 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. Use for window installations, interior hand rails, metal door frames, storm shutters, interior lighting fixtures, thresholds, or screened enclosures. Clamshell packaging.