#9 x 2-1/2" R4 Multi-Purpose Framing Screw (100/Pack)

GRK’s R4™ self-countersinking screw has a patented underhead with sawblade like cutting teeth and six self-contained cutting pockets. Together they act similar to a circular sawblade, 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.

•    Zero stripping with 6 points of contact
•    Enlarges hole to reduce splitting
•    Low torque, smoother drive, reduced splitting
•    No pre-drilling, faster penetration