The TIMCO Concrete Screws Flat Countersunk Silver – 7.5 x 120 provides a rapid and effective light duty anchoring system for fixing into concrete, brick, stone, concrete block and wood. This through fixing offers a single solution that replaces traditional fixings such as nylon frame and hammer fixings. Features zinc plating for increased corrosion resistance, TX30 drive recess to reduce driver wear and prevent camming-out, serrated V-threads for optimum insertion into all masonry types, and high-low thread on first 30mm to aid insertion and reduce torque. Ideal for fitting windows and door frames.