Description: These screws are made of 304 stainless steel, which is resistant to rust and corrosion.There are many length in one set which can be commonly used in home and office appliance, machinery, furniture, repair and inventions. Features: Made of 304 stainless steel material, the 304 stainless steel material provides strength and offers good corrosion resistance in many environments. Ideal for use in confined areas where the head needs to be flush or below the surface. Well packed and assorted in a transparent plastic box for convenient use and storage. There are six common lengths in this set for general purpose use which will meet daily basic needs. Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry. Specifications: Material: 304 stainless steel Type: Flat head hex socket Size and Quantity: M3 x 4mm 50pcs M3 x 6mm 50pcs M3 x 8mm 50pcs M3 x 10mm 50pcs M3 x 12mm 50pcs M3 x 16mm 50pcs Box Size: 13 x 6.5 x 2.3cm / 5.11 x 2.56 x 0.9" Package Includes: 300pcs x Screws .