Flat drilling cutting part grinding into a flat body, the main cutting edge grinding edge Angle, Angle and the formation of transverse edge;  Auxiliary cutting edge after grinding Angle and auxiliary Angle and control drilling diameter.  Flat drill front Angle is small, no spiral groove, chip removal is difficult, but the manufacture is simple, the cost is low, the diameter of 1mm below the hole processing has been widely used.  Flat drill as a result of the structure has greater improvement, plus the advantages mentioned above, so in the automatic line and CNC machine tool processing diameter of more than 35mm hole, also use flat drill.  

Contact me if you have any questions for twist drill bit, dtep drill bit and wood working drill etc.

As the outlook of hammer drill and masonry drill almost the same,many people can not distinguish them.So how to differ from hammer drill and masonry drill. We only need to look at the shank. Hammer drill had SDS-PLUS shank and SDS-PLUS shank. Masonry drill only has round shank. So it is quite easy to distinguish.

We can aslo provid you electric hammer drill,hole saw and saw blades...