The ATLAS Masonry Concrete Brick Screws are high-quality, zinc-plated steel fasteners designed for fixing UPVC, wood, and window & door frames. These round screws have a 7.5mm diameter and come in various lengths to suit your needs. With a countersunk head design WHICH REQUIRES A TORX T30 TO SCREW THEM IN they are yellow passivated finish, these screws provide a secure and stylish anchor solution for your masonry projects. The ATLAS brand ensures reliability and durability, making these screws a valuable addition to your fastening hardware collection.