Features: Made of 304 stainless steel material, the 304 stainless steel material provides strength and offers good corrosion resistance in many environments. Great for use in confined area where the head needs to be flush or below the surface. Seven common length from 8mm to 30mm that you can choose for general purpose use. These M4 screws will be great replacement for industrial and construction fasteners. Used widely in the home and office appliance, communication equipment and other machinery industry. Specifications: Material: Stainless steel 304 Standard: A2-70 Color: Silver Type: Flat head star drive Size: M4x8mm, M4x10mm, M4x12mm, M4x16mm, M4x20mm, M4x25mm, M4x30mm(Optional) Quantity: 50pcs d Pitch dk k t nominal theoretical max min max max min M4 0.7mm 9.4mm 8.4mm 8.04mm 2.7mm 1.53mm 1.14mm Package Includes: 50pcs x Screws