DEWALT DD5155 Impact Ready 5 Piece Titanium Drill Bit Set Ground from solid 1-piece design is up to 5 times more durable than the current 2-piece conventional product Patented web taper increases the rigidity of the bit to decrease the potential for bit breakage Patented pilot point tip allows users to drill holes faster and offers clean burr free holes Common users include electricians, HVAC, mechanics, glaziers and GC's