... .Thread type: machine thread, triangle thread, metric thread, tapping thread, drilling thread, half thread, full thread etc.2.Head type: Hexagon ... Screw, Drywall Screw, Chipboard Screw, Machine Screw, Deck Screw, Self Tapping Screw, Self Drilling Screw etc.Producing EquipmentScrew machine Hexing/SX & H series ...