GRK Fasteners GRK9X134R4 R4 Star Drive Flat Head Screw, 9 x 134 in.

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GRKs R4 self-countersinking screw has a patented underhead with saw-blade like patented cutting teeth and six self-contained cutting pockets. Together these features act like a circular saw blade, transporting the drill dust away from the edge of the screw hole while cutting a perfectly clean hole into even the most brittle materials without cracking any surface treatment. This design enhances the R4 s versatility by allowing the fastener to countersink into even the hardest woods. The screw head closes the hole off with precision, not leaving any damaged fibers around the head.

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

• Size: 9 x 134"