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Double headed bolt Expansion Screw Bolts,expansion bolts,wall anchor bolt,304 Stainless Steel Hex Socket Head Built-in Expansion Bolts Screws Internal Expansion Concrete Bolt M6 M8 M10 M12(M10X70) Fresh thread, precise structure. High toughness, strong , not easy to break or deform. Smooth and burr-free, easy to use. Multiple size options. Our positioning screws feature a unique dual end design: one end has self tapping threads that allow for... Double headed bolt Expansion Screw Bolts,expansion bolts,wall anchor bolt,304 Stainless Steel Hex Socket Head Built-in Expansion Bolts Screws Internal Expansion Concrete Bolt M6 M8 M10 M12(M10X70)