DeckWise #10 Bugle-Head screw fasten all types of wood decking including Ipe, Redwood, Cedar, and preservative-treated (PT) woods (non-hardwood). 316 Grade stainless steel for salt water installations and superior corrosion resistance from the elements. Use for optimum performance with hardwoods, thermally modified softwoods, PT softwoods and composite decking materials. Pre-drilling is not required except for exotic hardwoods. This line consists of Signature Color match painted heads; Hardwood Brown and Cedar to match your decking material plus, an unpainted stainless steel head for general purposes. These T25 drive deck screws swiftly penetrate decking with a Type-17 auger point including coarse threading which pulls boards tightly together. The double countersink flat bugle head has 6 nibs; utilizes a 6 lobe star drive to reduce cam-out and increase torque; and comes as a chipboard thread screw with partial thread and triple spline (one at the beginning on the thread and two at the end of point). FEATURES Made from high-quality 316 grade stainless steel Easy installation - T25 Star Drive finish heads. Match your wood color to the screw head. Drive with ease - Drive with ease - Auger tips cut through even the hardest woods Double countersunk flat bugle head has 6 nibs