Deck screws for pressure treated lumber, cedar, redwood, hardwood, composite, capped composite, and PVC decking .Edge deck screws fasten through the edge of the board for a fastener-free surface and are for exclusive use with CAMO MARKSMAN Pro tools. Reverse rake tip augers material out reducing splitting and cracking, reverse upper thread draws board tight. Trimhead reduces the visibility of the screw. 1-? in. (47.6mm) screws for boards 3/4–1 in. (19–25.4mm) thick and 2-? in. (60.3mm) screws for boards 1–1-½ in. (25.4–38.1mm) thick. T-15 Star Drive, driver bit is included