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Product Specification Package included: 5 Pcs, 2x 6 mm(1/4"), 1x 8 mm(5/16"), 1 x 10 mm(3/8"), 1 x 12 mm(1/2") Material: High quality tungsten carbide tip Multipurpose: tile, concrete, brick, glass, plastic and wood,etc Shank: 3-flats shank Package: plastic box Notice: When drilling hard material (glass, porcelain floor tile, marble or granite), please use water for lubrication User InstructionTool: Power drill. Do not use impact mode of drill or hammersWhen drilling hard material (glass, porcelain floor tile, marble or granite), please use water for lubrication