GRK KAM9234-5R Kameleon ProPak 9 by 2-3/4-Inch Composite Deck Screws, 420 Screws per Pail, Redwood Use GKR Bit T-20 Self-Tapping with fiber trapping rings W-Cut Thread Design with Zip-Tip Patented Climatek coating Composite and PVC deck screw