Unreinforced Frames covers a specialist range of window fabrication screws designed for fixing into non-reinforced PVCu profiles where precision and clean finishes are essential. These fasteners feature countersunk heads for a flush appearance, Phillips drive for reliable installation, and metric or single threads engineered for secure holding in softer frame materials. Available with self-drilling, self-tapping or gimlet points, ribbed or faceted heads, and a choice of zinc, yellow passivated or martensitic stainless steel with organic coatings, they offer dependable performance, corrosion resistance and efficiency across window and door fabrication applications.