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The DAA2 insulated panel screw for wood has been the showpiece of NES Fasteners & Fixings for years. This fastener is made entirely of stainless steel A2. The DAA2 does not have a steel drill point, but nevertheless drills fast through the skins of an insulated panel and then fixes itself in the wooden substructure. Because the fastener is made entirely of stainless steel A2, production costs are lower. This makes the DAA2 up to 50% cheaper than the Bi-metal versions
convinced yet? Test the DAA2 screw yourself at the Fastener Fair Global or ask
for a samples and test them yourself.
You can find the DAA2 here.