straight shank twist drill hole machining tool is the most widely used. It mainly consists of working part and handle part. The working part of the spiral groove, two twist shape, hence the name

twist drill according to their different functions, can be divided into three parts:

1. drill shank drill for clamping with part, and needed to pass on the drilling torque and axial force.

2. is located in the drill neck knife body and a drill handle between the transition section. Used as an air knife slot for a grinding wheel.

3. drill bit working part. The cutting part (i.e. drill) and a guide part.