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Long masonry drill bit.High quality nickel plated tungsten carbide tipped with negative chamfer and ground flutes for efficient swarf clearance.Cold roll formed giving uninterrupted grain structure for greater strength and durability.Available in 12 gauges: 5, 5.5, 6, 6.5, 7, 8, 9, 10, 12, 13, 14 & 16mm.