R4 MULTI-PURPOSE YZ SCREWS

GRK’s 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, leaving no damaged fibers around the head.

• Interior / Exterior Use

• - Decking
  - Stairs
  - Residential Construction 

• No Pre-Drilling Unless Material Requires
• Self Countersinking
• Starhead Recess / Non Stripping Heads
• Can Be Used With Fibrous Materials
• Extreme Threads
• Use in all woodworking and plastic applications
• Coated with Climatek Corrosion Protection
• Transports dust from edge of screw hole
• Screw head closes hole, leaving no damage
• Use T25 bit
• Quantity per Box: 600