From the Manufacturer
Use PHEINOX™ stainless steel fasteners in tropical woods, cedar wood, pools, hot tubs, saunas and seaside applications in areas with large daily temperature variances.
For best results, trim screws should be driven at half speed. To prolong the life of the #10 bit, do not use an impact driver on the #8 trim head screw.
Suggested Uses: Composite Wood & Wood Decking, Window Jambs, Door Jambs, and All Trim Applications.
GRK RT Composite ™