Patent attributes
A screw with protruding sheets on a head portion comprises a thread portion; a screw tail at one end of the thread portion, a slot formed on the screw tail; a plurality of screwing sheets formed at another end of the thread portion; a plurality of recesses formed between the plurality of screwing sheets for removing undesired pieces; a drilling head being formed at front ends of the screwing sheets; the drilling head formed with a plurality of protruding sheets made of soft metal. By screwing the screw by rotating from the slot, the screw will rotate so as to drill a hole and enter into a wood plate. Then the protruding sheets enlarge the hole. The undesired wood pieces are removed from the recesses. When the screw further drills into a metal plate, the protruding sheet will be worn out because the protruding sheet is made of soft metal.
