Patent ID: 7168348

Claim:
A screwdriver bit comprising: a drive section, said drive section having an end surface, and a front section, said front section being made from a hard-metal powder, said front section having an end surface, a mating surface opposing said end surface, a central axis extending between said end surface and said mating surface, and a profiled penetration section, said front section connected to said drive section such that said mating surface of said front section and said end surface of said drive section are adjacent to each other, said profiled penetration section extending between a base and a tip, said base adjacent said mating surface of said front section, said tip adjacent said end surface of said front section, said profiled penetration section including a body extending between said base and said tip, said body having a surface such that when said body is viewed in section taken along a plane extending through said central axis, said surface defines a pair of edges that are substantially linear, said front section having a front section length measured along said central axis between said mating surface of said front section and said end surface of said front section, said profiled penetration section having a penetration length measured along said central axis between said base and said tip of said profiled penetration section, and said profiled penetration section having a base diameter, said base diameter being measured at a base section in a plane perpendicular to said central axis and disposed along the central axis at said base of said profiled penetration section, said base section defining a base perimeter, said base diameter being of a circle circumscribing said base perimeter, wherein said front section length does not exceed 2.5 times said penetration length and the ratio of said front section length to said base diameter does not exceed 2.2.