Item Type: Countersunk Screw_x000D_ Material: A2-70_x000D_ Product Model: M4_x000D_ Standard: DIN 965_x000D_ Process: Black Galvanized_x000D_ Thread Diameter: Approx. 4mm / 0.16in_x000D_ Pitch: Approx. 0.7mm / 0.03in_x000D_ Screw Head Height: Approx. 2.2mm / 0.09in_x000D_ Head Diameter: Approx. 7.3mm / 0.29in_x000D_ Screwdriver Size: PZ2_x000D_ Black Zinc Plated Explained_x000D_ These screws are standard zinc plated screws with a decorative black coating applied._x000D_ The dip spin black coating offers a slightly increased level of protection against corrosion and is very thin so will not interfere with the threads, there is no build up in the threads or recess on the heads._x000D_ The coating is solvent based and is resistant to chemicals and is also RoHS2 compliant._x000D_ Please note though that due to the thin application on these screws, it is possible that the coating may scratch slightly.