Package Included 50 x Carbon Steel Hexagon Socket Cap Screws with Same Length Specification Model M3CH9Mateiral Carbon SteelGrade 12 9Color BlackScrew Drive Type Hexagon SocketScrew Head Type Cap HeadLength 4mm 6mm 8mm 10mm 12mm 16mm 20mm for Option Note If your want another length in bulk please contact us Features Black appearance dark color will fit well in different occasions With 4 6 8 10 12 16 20mm lengths for option choose the appropriate length you need then it will come with 50pcs screws with same length The length of hexagon socket screw is measured from underneath the head to the flat of the point Socket cap screws are commonly used in machine parts die fixturing and clamping The socket head enables driving where there is not sufficient space for wrenches or sockets Made of carbon steel extremely high hardness makes them good at resisting abrasion and retaining shape They can withstand significant force before deforming Widely used for industry equipment quadcopter DIY crafts home repairing and so on More Details