GRK FASTENERS 01105 9x318 R4 Star Drive FH 425/ProPak offers a revolutionary solution for your fastening needs. This self-countersinking screw features a patented underhead with saw-blade-like cutting teeth and six integrated cutting pockets, ensuring a clean hole in even the most brittle materials without compromising surface finishes. The innovative design allows the R4™ screw to countersink effortlessly into the hardest woods, providing a flawless finish without damaging fibers around the head. Ideal for both interior and exterior applications, this fastener excels in decking, stairs, and various residential construction projects. With the capability to eliminate pre-drilling in most cases, the R4™ significantly reduces installation time while maintaining performance. The starhead recess prevents stripping, ensuring a secure fit every time. Each Pro Pack includes 425 screws, with a size of #9 x 3-1/8", making it a practical choice for professionals and DIY enthusiasts alike. For optimal use, employ the red driver tip for #6 and #8 screws and the green driver tip for #9 and #10 screws. Weighing 4.89 lbs, this product can ship via UPS, making it easy to stock up on this essential hardware for your next project.

9x318 R4 Star Drive FH 425/ProPak

• Use Red driver tip for #6 and #8 screws
• No Pre-Drilling Unless Material Requires
• Extreme Threads
• Interior / Exterior Use - Decking, Stairs and Residential Construction
• Use Green driver tip for #9 and #10 screws
• Self Countersinking
• Starhead Recess / Non Stripping Heads
• Can Be Used With Fibrous Materials