GRK RT Composite screw is a specially designed fastener for attaching composite and cellular PVC materials. The RT Composite has a reverse threading under the head of the fastener that helps the screw head disappear beneath the surface and eliminate mushrooming when installing Composite materials. RT Composite Screws have a Climatek Coating for installation in both interior and exterior conditions where exposure to moisture is intermittent and is code-approved for use in treated lumber.
- White color provides an ideal finish 
- Specially designed for attaching composite and cellular PVC material 
- Reverse thread design prevents mushrooming to create an even surface 
- Trim head provides a clean finished look 
- Zip-tip allows for no-pre drilling and one step installation 
- Star drive eliminates stripping for improved productivity 
- W-cut low installation torque allows for fast driving and ease of install 
- ESR-3201 approved for trim applications 
- Limited lifetime warranty