【Name】 - M2-0.4 x22mm Socket Head Cap Screws Bolts 【SIZE】 -Thread Diameter:0.4mm，Thread Length：22mm(Head not Included) 【USED】 - Hexagon head screws are widely used in machinery manufacturing, automobiles, motorcycles, aerospace, electronic equipment, toys, furniture and other fields, which are very suitable for high-strength connection in these fields. 【Package】 -30 x Socket Head Cap Bolts/Screws. 【Material】 - Made of stainless steel 304 Socket cap screws, also known as Allen head screws, have a recessed drive, and are commonly used when there is not enough clearance for a conventional wrench or socket. They are fastened with an Allen wrench, which is also called a hex wrench or hex key.