... , and thread rolling.Specifications: Head: Pan head, Flat head, Indented hex head, Indented hex washer head, Serrated hex washer head, Truss head, Oval head, wafer head, Round head Recess: Phillips, Slotted ... , Phillips/Slotted, Hex, Slotted/Hex, Torx, Pozi, Square .Diameter: #4 ...