50Pcs Countersunk Screw Flat Cross M4 A2‑70 Connection Part for Repair MaintenanceM4x8 Item Type: Countersunk Screw Material: A2-70 Product Model: M4 Standard: DIN 965 Process: Black Galvanized Thread Diameter: Approx. 4mm / 0.16in Pitch: Approx. 0.7mm / 0.03in Screw Head Height: Approx. 2.2mm / 0.09in Head Diameter: Approx. 7.3mm / 0.29in Screwdriver Size: PZ2 Black Zinc Plated Explained These screws are standard zinc plated screws with a decorative black coating applied. 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. The coating is solvent based and is resistant to chemicals and is also RoHS2 compliant. Please note though that due to the thin application on these screws, it is possible that the coating may scratch slightly.