High performance self countersinking screw for fast accurate driving into softwood, chipboard, and most hardwood. Features 2 patented slots to prevent splitting near edges. Ribs and tucks under the head ensure flush fitting without surface damage. Waxed thread reduces driving resistance by up to 40 percent. The 20 degree needle point penetrates wood easily without a pilot hole. Reinforced collar prevents snapping. Zinc and yellow passivated for up to 20 times more rust resistance compared to standard BZP screws. Ideal for professional and DIY use.