Screw, Self Drilling Screw, Self Tapping Screw manufacturer / supplier in China, offering C1022A Yellow Zinc Double Wing Hex Flange Head Self Drilling Screw, C1022A Greay Ruspert Coating Sst1000h With18 Ribs Flate Head Self Drilling Screw, Basalt Nylon Head Self Drilling Sst1000h Double Thread for Roofing Screw and so on.