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7.5mm diameter on all sizes. This versatile fixing is rapidly becoming the most popular method of securing window and door frames to all types of masonry. The screw forms its own thread in a pre-drilled 6mm ø hole in the masonry providing a stress free fixing which enables it to be used in close to edge applications. Being fully threaded it provides a point of anchorage at every point it touches the masonry and the Torx drive head significantly reduces the risk of 'rounding off' the head during installation.
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