BBosch TI21 Titanium Drill Bit Set, 21-Piece ReviewbP PP Bosch TI21 Titanium Drill Bit Set, 21-Piece PSuper-hard titanium coating lasts up to six times longer than high-speed steelPFeatures split points that start on contact with no walking or skating, eliminating need for a center punchPTitanium reduces heat for longer lifeP