Drill

A drill for stack drilling comprising a drill body having a drill diameter and provided with chip flutes, a first cutting insert releasably secured to a first insert site of said drill body, and a second cutting insert releasably secured to a second insert site of said drill body, said first and second inserts disposed mainly on opposite sides of a rotary axis of said drill body adjacent a forward end thereof, said first insert arranged at least partly radially inside of said second insert, said first insert having a first active cutting edge which includes first, second, and third cutting edge portions, said first cutting edge portion being disposed radially closer to said axis than said second and third cutting edge portions, said third cutting edge portion disposed radially farther from said axis than said first and second cutting edge portions, said second cutting edge portion interconnecting said first and third cutting edge portions and forming therewith inner and outer obtuse angles, respectively, said first cutting edge portion being shorter than each of said second and third cutting edge portions, a bisector of said outer obtuse angle being rearwardly convergent with respect to said axis and forming an acute angle therewith as said drill is viewed in a direction perpendicular to said axis, said second insert having a substantially straight second active cutting edge, a first imaginary extension of said second cutting edge portion of said first insert intersecting said axis at a first point as said drill is viewed in said direction, a second imaginary extension of said second cutting edge intersecting said axis at a second point as said drill is viewed in said direction, said first and second imaginary extensions forming substantially equal angles with said axis as said drill is viewed in said direction, said second point being spaced rearwardly with respect to a forwardmost end of said first cutting edge portion.