Deck screws suitable for use with composite lumber

The invention relates to a flat a bolt for composite material; and it can is further arranged on the other woodware, a example the material of the stress management, a flat screw top of the invention of the head and a rod part, the rod part of the diameter of different two regions. The length unit, the upper areas of thread is larger than the thread of the lower part. A rod part of the screw is formed of a counter-zigzag. The lower area of rod part terminates with a conical cusp's portion; the guide portion bolt passes through the material. The thread of the lower area of rod part. The cephalization of the bolt is surface, and lower two top part of the head is extended. The top part is longer than the head of the lower, and hollow area between the top part of the lower edge of the screw of parts. The head portion is further formed by the cut. , Bolt head capable of the square screwdriver opening, the opening of the receiving device personnel is a square and the mounting screw. A example, an opening can be a #2 square opening screwdriver. The understand, capable of the different size Philip flat or head.