Zip screws are the contractors choice for fastening downspouts and elbows together.ZIP screws taper down to a sharp point that allows them to create their own holes as you drive them into a substrate, as long as the material isn_x0019_t too hard. Unlike other screws, like wooden rivets, a ZIP screw_x0019_s shank is hard. These screws allow you to apply extra force with less slippage or damage to the recess







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