Diall Double-Countersunk Zinc-Plated Carbon Steel Screw - Silver

These screws are particularly recommended for fixing plasterboard to timber frames and general DIY wood assembly.

Pre-drilling is recommended, especially for harder woods, to prevent splitting and ensure the screw drives straight. For plasterboard, it may not always be necessary but can improve accuracy.

While they have zinc plating for some corrosion resistance, they are best suited for indoor applications. For prolonged outdoor exposure, screws with higher rust resistance like stainless steel are recommended.

It means the head of the screw is angled on both the top and underside to sit flush or slightly below the surface of the material being fastened, providing a neat finish.

The screws are 90mm in total length, with approximately 60mm of that length being threaded.

These screws are intended for general DIY and fixing applications. For structural applications, it is always recommended to consult with a building professional to ensure appropriate hardware is used.

Ensure you are using the correct size and type of screwdriver bit. Reduce driving speed and pressure. Pre-drill a pilot hole if you haven't already, especially in harder materials.

Check if a pilot hole is required for the material. Ensure the pilot hole is not too large. For plasterboard, ensure you are hitting a stud or using appropriate wall anchors if fixing directly into plasterboard without a stud.

The countersinking may not be deep enough. Use a countersink bit to slightly enlarge the pilot hole before driving the screw, or ensure consistent pressure during driving.

This can occur if stored in a damp environment. While zinc plating offers some protection, prolonged exposure to moisture will eventually cause rust. For highly humid or outdoor environments, consider rust-resistant alternatives.