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25 deg needle point for immediate start. Two patented slots prevent splitting when screwing close to the edge. Yellow tropicalised to provide superior rust resistance (than BZP) Lubricated, sharp, deep, wide thread reduces driving resistance and removes the need for a pilot hole. Re-inforced collar to prevent snapping and allow deep pozi recess to reduce "cam-out". Distinct ribs & tucks under head for self-countersinking.