High performance all purpose self-countersinking screw for fast, accurate driving into softwood, chipboard, and most hardwood. Features 2 patented slots to prevent splitting close to the edge. Ribs and tucks enable flush fitting without surface damage. Includes a waxed thread. Zinc and yellow passivated finish provides up to 20x more rust resistance than standard BZP screws. These Reisser Cutter screws have an advanced design for fast and accurate driving. The ribs and tucks under the head ensure a flush fit against the surface without damage. Designed for maximum precision, slots prevent splitting when working close to the edge. A 20 degree needle point is sharp enough to penetrate almost all timbers without a pilot hole. A wide, deep thread reduces driving resistance by up to 40 percent. Reinforced collar prevents snapping and adds depth. Two patented slots prevent splitting when screwing close to the edge. The zinc and yellow passivated coating offers enhanced rust resistance.