The TIMCO Concrete Screws Flat Countersunk Gold – 7.5 x 150 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 high-low thread on first 30mm to aid insertion and reduce torque. The zinc plated and yellow passivated finish provides increased corrosion resistance, making these screws ideal for fitting windows and door frames.