the ultimate composite deck screw. C-deck composite deck screws are for use with wood, composite, pvc and other plastic materials. Stainless steel c-deck screws are available in 10 colors that will match most common deck colors on the market and has shown over 1000 hours of resistance in salt spray tests. C-deck is specially designed to eliminate the mushrooming and blemishes that can occur in composite materials. features: pressure treated compatible – excellent performance in all plastic composite, pvc & wood decking eliminates composite mushrooming, does not produce secondary lumps around the head leaves a smooth, flush, countersunk finish, starts easily and drives with less torque, reduced splitting