The TIMCO Concrete Screws Flat Countersunk Gold – 7.5 x 80 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 include TX30 TX Drive recess to reduce driver wear and prevent camming-out, serrated V-threads for optimum insertion into all masonry types, and zinc plated with yellow passivated finish for increased corrosion resistance. The high-low thread on the first 30mm aids insertion and reduces torque, making them ideal for fitting windows and door frames.