3-1/6'' X 2-1/4'' Concrete Screws

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. null -.