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Hex Washers Head Self Drilling Steel Roofing Screws Self Drilling Screw Self Drilling Screw Machine Global Sell, Find Details and Price about Hexagon Head Drilling Screws Screws from Hex Washers Head Self Drilling Steel Roofing Screws Self Drilling Screw Self Drilling Screw Machine Global Sell - Handan Yongnian District Jinsong Standard Parts Co., Ltd