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Lenox step drill bits have a patented two flute design which helps them cut fast, clean, round holes with rapid and efficient chip removal. Features & Benefits • Accurate, burr-free holes • Patented two flute design cuts fast, clean, round holes • Starts on contact • Split point design for faster penetration and less walking • Long tool life • Steam oxide coating adds durability • Enhanced flute design removes chips rapidly Specifications • Diameter: 20-34mm