TIMco Concrete Screws Flat Countersunk Silver - 7.5 x 80 A rapid and effective light duty anchoring system for fixing into concrete, brick, stone, concrete block and wood. This through fixing provides a single solution and replaces traditional fixings such as nylon frame and hammer fixings. Designed to replace traditional masonry fixings TX30 TX Drive recess to reduce driver wear & prevent camming-out Serrated V-threads to achieve optimum insertion into all masonry types Zinc plated for increased corrosion resistance High-Low thread on first 30mm to aid insertion and reduce torque