High performance, self-countersinking woodscrews with no need to counterbore. Feature reinforced collar to prevent snapping, 2 x split-prevention slots, deep PZ recess to reduce risk of cam-out, tropicalised yellow coating for rust resistance and lubricated thread to reduce driving resistance. 25° needle-point offers immediate start. Supplied in a tub. Ribs Under Head for Clean Countersinking Carbon Steel Construction Zinc-Plated & Yellow-Passivated Low Friction Coating Optimised Thread to Reduce Torque & Enhance Pull-Out Resistance Partially Threaded