Allen Hex Drive Size: 3 mm Metric; Package: 100 PCS Diameter of the head: 6.78mm (max), Height of the head: 4.0mm (max); Screw Length: 12mm (excluding the height of the head) Manufactured with a high-precision process; Featured with a cylindrical head and internal hex drive that allows higher tightening torque; Widely used in home, industrial, automotive, constructions, tools, laptops, 3D printers, both indoor and outdoor applications; The flush head provides a clean look when installed Thread: Full Coverage; Thread Pitch: 0.7mm; Bright Finish and Silver Tone Color Material: 304 Stainless steel 18/8 which provides good strength and perfect corrosion resistance in bad environments like high temperature, cold weather and high humidity areas without the need for time consuming and costly maintenance Socket head cap screws are precision threaded fasteners with an internal hex drive also called allen hex drive.They are known for their effecient application performance and endurance widely used in a variety of industries such as construction, manufacturing, engineering, assembling and so on. The 304 stainless steel provide perfect strength and good corrosion resistance in bad environments like high temperature, cold weather and high humidity areas without the need for time consuming and costly maintenance