GRK Fasteners R4 Framing and Decking Screw, Thread Size: #9, 3-1/8 in L, Drive Type: Star, Steel, Package Quantity: 100 PK, Multi-Purpose, Thread Length: 2.08 in, Drive Size: T25, Applicable Materials: Cement Fiber Board, Melamine, Particle Board, Plastic, Sheet Metal, WoodFast bite tip eliminates pre-drilling and provides a fast start for one-step installationW-Cut low torque, faster drivePrecision fit reduces wobble between R4 screws and GRK bits for improved productivityZero stripping, with six points of contactOptimized thread length improves clamping force for increased drawing powerCEE Thread enlarges hole to reduce splittingCutting teeth cuts wood fiber and provides flush seatingHead markings for easy identificationClimatek coating is AC257 code approved for use in treated lumber