Features： 1、Zinc Plated: These screws are standard zinc plated screws with a decorative black coating applied, increasing the tightness of the product. 2、Black Coat: Black coating offers a slightly increased level of protection against corrosion and is very thin so will not interfere with the threads. 3、Safe Coating : The coating is solvent based and is resistant to chemicals and is also RoHS2 compliant. 4、No Build Up: There is no build up in the threads or recess on the heads. Convenient to use. 5、Note: Please note though that due to the thin application on these screws, it is possible that the coating may scratch slightly. Specification： Item Type: Screw Material: A2-70 Stainless Steel Model: M3, M4 Operative Standard: DIN 7985 Process: Black Zinc Plated  Model M3 M4 Thread Diameter 3mm / 0.12in 4mm / 0.16in Pitch 0.05mm / 0.02in 0.7mm / 0.27in Head Height 2.4mm / 0.09in 3mm / 0.12in Head Diameter 5.6mm / 0.22in 7.8mm / 0.3in Screwdriver Size PZ1 PZ2 Package List： 50 x M4x12 Screw