High performance all purpose self countersinking screw for fast accurate driving into softwood, chipboard and most hardwood. Reisser Cutter screws feature an advanced design for maximum precision. They have 2 patented slots to prevent splitting when working close to the edge. Ribs and tucks under the head ensure a flush fitting without surface damage. A 20 degree needle point is sharp enough to penetrate almost all timbers without a pilot hole. The wide, deep thread is designed to reduce driving resistance by up to 40 percent. A reinforced collar prevents snapping. Zinc and yellow passivated for up to 20 times more rust resistance than standard BZP screws. These screws have a waxed thread.