Hexagon Wafer Head Self Tapping Screw with Very Long Length Head type: CSK/flat head, truss head, trumpet head, wafer head, pan framing head, pan wafer head, hexagon head, pan headThread type: ... screw: 150 to 300mmDiameter of thread: 6.3mHead recess: Philips 4 ribbs, Pozi, Philips, Square, HWF undercut, HWH, serration, flower head ... quality, and reasonable price Hexagon Wafer Head Self Tapping Screw