Patent ID: 7267513

Claim:
A bit, comprising: a driving end portion; a shank connected to said driving end portion; a blade attached to said shank, said blade having a pair of parallel opposite faces connected by a pair of outer sides being generally parallel to said shank; a pair of lateral shoulders extending inwardly from said outer sides and converging at a central point portion to form a leading end of said blade; and a cutting edge portion forged along the leading end of said blade, wherein a portion of said blade is forwardly bent in the direction of rotation, and wherein each of said lateral shoulders is forwardly bent from said respective outer sides to said central point portion, wherein said central point portion has defined therein a first plurality of discontinuous threads and a plurality of continuous threads, wherein: said central point portion includes a tip and a base, said plurality of continuous threads are positioned adjacent to said tip of said central point portion, and said first plurality of discontinuous threads are interposed between said plurality of continuous threads and said base of said central point portion.