High Strength: Made of 12.9-grade steel, offering excellent tensile strength and durability for demanding mechanical applications. Precision Fit: M3.5 x 4mm size with hex socket and headless cup point design, ideal for secure, flush fastening. DIN 913 Standard: Manufactured to DIN 913 / 45H specifications, ensuring consistent quality. Corrosion-Resistant: Black oxide coating provides protection against rust and wear in dry environments. Pack: Includes 50 pieces, perfect for repairs, assembly, or stocking in workshop or industrial use., Manufacturer: The Lord of the Tools