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. Zinc plated with a pan head to improve clamping. 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 Ideal for fitting windows and door frames Pan head for improved clamping All steel, non-flammable fixing conforming to BS 7671 standard's 18th edition, which requires wiring systems to be supported by materials which are unlikely to prematurely collapse in the event of a fire. " Thread Dia. mm: 7.5 Length mm: 80 Recess Type: TX Drive Head Type: Pan Finish: Zinc Drill Hole Dia. mm: 6.0 Fixture Hole Diameter mm: 8.0 Max Fixture Thickness mm : N/A Min Embedment Depth mm: 50 Timco Concrete Screws - TX - Pan - Zinc (Size 7.5 x 80 - 100 Pieces) in Silver