Nail screw with flat head but collar.be used to quick installation in concrete, brick , natural stone.in construction of nail screw used long elastic polypropylene plug, and screws with thread,that has characteristic spiral tile.Nail screw with flat head but collar.be used to quick installation in concrete, brick , natural stone.in construction of nail screw used long elastic polypropylene plug, and screws with thread,that has characteristic spiral tile.
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