Features Hex Socket Screw Made of 304 stainless steel material, the 304 stainless steel material provides strength and offers good corrosion resistance in many environments,high strength, high cost performance. Hex Socket Screw Great for use as fixing component, industrial and construction fasteners,Stable quality, praised. There are several common lengths in this set for general purpose use which will meet daily basic need. Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry,very popular. Well packed and assorted in a transparent plastic box for convenient use and storage. Specification: Material: 304 stainless steel Size & Quantity: M3*8  20PCS M3*10  20PCS M3*18  20PCS M3*20  20PCS M3*30  20PCS M2.5*25  20PCS M2.5*20  20PCS M2.5*16  20PCS M2.5*10  20PCS M2.5*8  20PCS M2*20  20PCS M2*16  20PCS M2*10  20PCS M2*8  20PCS M2*6  20PCS Package list: 1 box * Fasteners Package List