Our high-strength Flat Countersunk Head Masonry Anchors are the perfect solution for securely fixing uPVC and timber frames directly to masonry. Constructed with carbon steel and finished with a zinc-plated and yellow-passivated coating, these anchors are suitable for both domestic and trade use. The 5 locking ribs and deep high/low thread provide exceptional pull-out resistance, ensuring that your frames stay securely in place. A pilot hole is required for installation and the anchors are heat-treated for added durability. Upgrade your masonry installation with our Flat Countersunk Head Masonry Anchors.