The Metalgrip Self Drilling roofing screw is manufactured for fastening metal roofs to metal buildings. It is a #12 screw with 14 threads per inch. Secure metal to metal purlins up to a .210 steel thickness with the self-drill point #3. Use the self-drill point #5 for attaching metal to steel up to .500 thick. metal to metal purlins up to a .210 steel thickness with the self-drill point #3. Use the self-drill point #5 for attaching metal to steel up to .500 thick.
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