Simpson PPHD Sheathing to CFS Screw #10 x 1 3 4 in. T25 Flat Head Quik Guard Collated 2000 Pk Deck Drive DHPD HARDWOOD Screw (Collated) 2 Flute Carbide Tipped Construction two 2 Flute Carbide Tipped Construction two cutting teeth per bit strike a practical balance between chip clearance and surface finish quality The tapered core design specifically addresses the common problem of flute breakage during deep hole drilling a critical advantage when working in reinforced concrete or thick masonry where bit failure can cost significant time and money these screws streamline workflow on framing and sheathing applications where speed and structural reliability are both priorities broadening the range of job site conditions where these screws can be confidently used