self threading cross recessed countersunk screws close selective focus |
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| navigate by keyword : background closeup coating confirmat corrosion countersunk cross cylindrical drive external fasten fasteners fastening head heap male materials metal pile plated recessed screw selftapping selfthreading size steel thread zinc |
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| Pile of cylindrical self-threading cross recessed countersunk screws with zinc corrosion coating, top view close-up in selective focus |
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