Hex Bolts, Carriage Bolts, Timber Bolts manufacturer / supplier in China, offering Torx Csk Chipboard Screw with 6 Ribs, Knurled Neck, Double Thread, High Quality Black Bugle Head Coarse Thread Drywall Screw, ISO10644 Screw and Washer Assemblies Made of Steel with Plain Washers and so on.