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1/2/5pcs M2 M2.5 M3 M4 M5 M6 M8 304 Stainless Steel Knurled Head Thumb Bolt Machinery Tool Round Adjustment Hand Thumb Screw 1/2/5pcs M2 M2.5 M3 M4 M5 M6 M8 304 Stainless Steel Knurled Head Thumb Bolt Machinery Tool Round Adjustment Hand Thumb Screw 1/2/5pcs M2 M2.5 M3 M4 M5 M6 M8 304 Stainless Steel Knurled Head Thumb Bolt Machinery Tool Round Adjustment Hand Thumb Screw