Solid Carbide Drills The Anatomy of a Drill The Anatomy of a Drill Use this diagram when describing features of a solid carbide drill. Point Length (L5) Point Angle Diameter Shank Diameter (Y) (D1) (D) Max Drill Depth (L4 max) Flute Length Shank Length (L3) (LS) Overall Length (L) Use this diagram when describing features of a solid carbide step drill. Point Length (L5) Chamfer Angle (Y2) Point Angle Diameter Shank Diameter (Y) (D1) (D) Drill Depth before Chamfer (SDL1) Shank Length (LS) Overall Length (L) T142 widia.com