【Name】 - M2.5-0.45x5x4mm Button Head Socket Cap Screws Bolts 【SIZE】 -Thread Diameter:0.45mm，Thread Length：4mm(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】 - 50 x Button Head Socket Cap Screws/Bolts. 【Material】 - Made of stainless steel 304 Button heads are rounded and low profile. Allen (hex socket) drive is a six-sided recess for use with an allen wrench (hex key).