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Knurled Thumb Screw/Truss Head Bolt/Adjusting Screw/Knurled Screw/Carbon Steel Bolt, Find Details and Price about Flat Head Rolling Flower Hand Screw Rolling Flower Large Round Head Bolt from Knurled Thumb Screw/Truss Head Bolt/Adjusting Screw/Knurled Screw/Carbon Steel Bolt - SHUIFU HANYANG MACHINERY TECHNOLOGY CO., LTD