Features: 1Zinc Plated: These screws are standard zinc plated screws with a decorative black coating applied, increasing the tightness of the product. 2Black Coat: Black coating offers a slightly increased level of protection against corrosion and is very thin so will not interfere with the threads. 3Safe Coating : The coating is solvent based and is resistant to chemicals and is also RoHS2 compliant. 4No Build Up: There is no build up in the threads or recess on the heads. Convenient to use. 5Note: Please note though that due to the thin application on these screws, it is possible that the coating may scratch slightly. Item Type: Screw Material: A2-70 Stainless Steel Model: M3, M4 Operative Standard: DIN 7985 Process: Black Zinc Plated ModelM3M4 Thread Diameter3mm / 0.12in4mm / 0.16in Pitch0.05mm / 0.02in0.7mm / 0.27in Head Height2.4mm / 0.09in3mm / 0.12in Head Diameter5.6mm / 0.22in7.8mm / 0.3in Screwdriver SizePZ1PZ2 50 x M4x10 Screw