Flat Head Countersunk Recex Drive Woodmaster Serrated Thread Assembly Wood Screws for woodworking applications. Ideal for cabinet and furniture construction, countertop and cabinet installation, hinge and hardware applications. These flat head wood screws feature integrated self-countersinking nibs on the underside of the head to ensure an easy flush installation. The patented sharp, deep and serrated Woodmaster threads offer quick starting, reduced splitting, reduced installation torque and a tighter hold. The threads are dry lubricated for ease of installation with reduced torque and effort. These fasteners feature the patented Recex Square-Phillips combo recess drive designed to offer the dependability of a Square recessed drive with the convenience and after-market serviceability of a Phillips drive.