tool for making holes

Diamond drill bits come in many different sizes and shapes but are primarily of two basic styles, 

blunt nose bits and core drill bits. 

 There are also two basic types of diamond drill bits relating to the application of the diamonds; bonded and sintered.

Features:

1. Super hard carbide tip, good quality Cr40 shank, auto-welding with silver material, or HF welding;

2. Drilling on glass, granite, tile and glass material, good concentricity and sharp tip could guarantee the concentricity and good quality;

3. Heat-treatment: auto net belt stove handling equipment, could meet strictly torsion test;

4. Surface treatment: Zinc-coated, black finished, electric-plated and sand-washed