Allen Hex Drive Size:M6x14mm(0.55") Screw Length: 14mm (excluding the height of the head); Thread Coverage: Full Thread Diameter of the head: 10.3mm (max); Height of the head: 3.3mm (max); Thread Pitch: 1mm; Color: Black The button head socket cap screws are 10.9 Grade Alloy Steel which offers chemical and corrsion resistance. Button head socket cap screws are precision threaded fasteners with an internal socket drive (also called allen hex drive) for installing in areas with limited side clearance. The internal hex drive requires an Allen wrench. They are known for their efficient application performance and endurance widely used in a variety of industries such as construction, manufacturing, engineering, assembling, aircraft and so on.