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Specification Material : Premium Carbide Tip Package included : 10 pcs,4x 6mm(1/4"),2x 8mm(5/16"),2x 10mm(3/8"),2x 12mm(1/2") Color : Blue & silver Product Feature : The multi-material drill bit can drill holes on tile,concrete,brick,glass,ceramic,plastic and wood. High quality,durable,pricise drilling in various materials at same time,convinient for use with long life time. Note : When drilling hard material (glass,ceramic tile,marble or granite),please use water for lubrication. Universal handle for electric drills and bench drills, but NOT fit for impact drills. Please keep away from the kids under 3-year-old to avoid hurting by mistake.