A rapid and effective light duty fixing ideal for attaching ironmongery to concrete, stone and brick without the need for nylon plugs. Pan head to improve clamping.TX25 TX Drive recess reduces wear & camming-out.Serrated V-threads to achieve optimum insertion.High-Low threads for ease of insertion.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.