Cemented carbide drill bit

In a drill bit made of superhard material having a drill bit body with a drill diameter d, lands and flutes separated by said lands in said drill bit body, a shank end and a cutting end in said drill bit body, said lands having a circumferential width a, said flutes having a circumferential width b, said drill bit body having a central web with a web diameter c, a longitudinal central axis extending lengthwise through said central web, and cutting lip means, said drill diameter d defining a drill periphery, the improvement comprising a flute width ratio b to a in a range from 0.4:1 to 0.8:1, a web thickness ratio c:d in a range from 25% to 35% of said drill diameter d, a radial rake angle (.theta..sub.r) of said cutting lip means taken at positions spaced at least 2/3 of said drill diameter toward said drill periphery within the range of -5.degree. to positive angular values, and a distance L from a line perpendicular to a reference line (l) connecting an outermost point (P.sub.1) on said periphery of said cutting lip means as seen in an end view of said cutting end and a point (P.sub.2) located inwardly relative to said point (P.sub.1) on the cutting lip means spaced 2/3 of a drill radius from said central axis, to an outermost peripheral end point (P.sub.3) on a flute wall opposite to said cutting lip means across the respective flute, said distance L corresponding to not more than 47% of said drill diameter d.