GRK Fasteners R4 121050 Screw, #9 Thread, 3-1/8 in L, Bugle Head, Star Drive, Self-Drilling, Self-Tapping Point, Stainless

GRK Fasteners R4 Screw, Thread, 3-1/ L, Bugle Head, Star ● Quick-release ratchet mechanism ● Non-slip grip handle design ▶ Upgrade Your Tool Collection Today

GRK’s R4â„¢ self-countersinking screw has a patented under head with saw-blade like cutting teeth and six self-contained cutting pockets. Together they act similar to a circular saw-blade, transporting the drill dust away from the edge of the screw hole while cutting an ideally sterilize hole into even the most brittle materials without cracking any surface treatment. This design enhances the R4â„¢’s versatility by allowing the fastener to countersink into even the hardest woods. The head of the screw closes the hole off with precision, leaving no damaged fibers around the head. R4â„¢ screws 3-1/8 in and longer have a four-threaded CEE thread. This enlarges the screw hole for the non-threaded portion of the fastener, allowing the wood to settle easily. It increases the screw’s drawing strength and reduces the friction on the screw shank that lowers the driving torque.