With the Spax Spax-RA frame anchor screw, you install window and door frames quickly, securely, and completely distortion-free. This 7.5 x 120 mm fully threaded screw is driven directly into pre-drilled holes in masonry, concrete, or timber without any wall plugs, preventing frame profiles from warping. The t-star plus T30 drive prevents slipping and ensures optimal power transmission while driving. Thanks to the flat countersunk head, the screw sits neatly flush with the surface for a clean finish. In addition, the durable wirox coating delivers long-lasting corrosion protection throughout your renovation and new-build projects.