Solid carbide drill, designed with shank diameter (D2) of 3 mm and tip angle of 130º.
From drilling diameter (D1) of 3.1mm to 6mm, the point angle changes to 165º.

Solid carbide drill designed with a shank diameter (D2) of 6 mm and a tip angle of 130º ground on all four faces, which allows good self-centering when drilling. The helixs are micropolished to facilitate chip removal.