... , Hex flange head, Button head,Triangular head , Round head, Ball head ,Spherical Cheese Head,Hexagon socket ... , Torx, Rice character type, One Way etc.MaterialCarbon steel, stainless steel, SS-304, SS-302, Aluminum, Brass, Bronze ... , medium carbon alloy steel etc.Surface TreatmentZn-plating, Ni-plating, Cr-plating ... of screw ,machine screw ,stainless steel screw and fasteners