GRK Fasteners 01077 8X2 R4 Star Drive FH 850/ProPak

8X2 R4 Star Drive FH Pro Pak
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.

• 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