The CorePlus Diamond Tile Drill Bit provides professional fast clean cutting on porcelain and ceramic tiles Leading-edge vacuum brazing technology ensures the diamonds stay bonded for extremely long life It uses premium-grade braze-bonded diamonds designed to cut the hardest of materials Easy start no-drill guide required Requires minimal water cooling not a continuous water feed Core waste material auto-ejects allowing continuous hole cutting Fitted with a Tri-Flat shank for excellent performance on cordless drills