Reference of front cutting-edge profile of center drill bit/chamfer drill bit/profile drill bit

Situation of general drilling holes

Alloy steel, heat treatment steel, stainless steel
Cutting-edge profile after point angle changes
Even the same helix angle, when point angle is 118,
cutting-edge is straight line, but if 135 it is an internal
cylinder, if 90, it is a cylinder.

Strengthened and toughness shear-steel, hard materials

Cast iron, aluminum
Plain shank drill bit for high hardness application
Masses drill for machining high manganese steel
We can also profile and precision grinding machining according to requirements of drawings, samples.