7.5mm x 102mm Torx Concrete Frame Screws, 100 Pack - 

Reisser Concrete Frame Screws offer a versatile fixing solution for a variety of materials. Ideal for fixing window / door frames, timber battens, facades etc. into masonry. With a Torx drive for maximum torque transfer and reduced “cam out” the Concrete Frame Screws gives a through fixing solution to prevent the need for marking and re-positioning. Locking ribs under the head fix firmly into the material and the flat pan head gives a neat finish when in place. The interlocking high low thread pattern gives very high pull out values, whilst the serrations on the threads removes more debris and reduces fixing stress, this also allows for closer fixing centres than expansion anchors and can be used closer to the edge of substrates.