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UEUC Glass and Tile Drill Bit This drill bit kit features with double slot drilling design to drill faster than previous drill bit. These drill bit feature with carbide as a material and improve durability. This design effectively removes sawdust and chips and helps prevent plugs from becoming stuck in each drill. Item Specification Material: High quality tungsten carbide tip Shank: 3-flats shank Used for:tile, concrete, brick, glass, plastic and wood,etc Notice When drilling hard material (glass, porcelain floor tile, marble or granite), please use water for lubrication