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By certification 
Features:
1. Energy-saving,more durable.
2. Smooth cutting surface, high cutting speed.
3. Good hole cleaning ability.
4. We can design and manufacture according to customer’s requirement of the Bit
Diameter,NO. of air holes,button shape and the face shape.
1. Energy-saving,more durable.
2. Smooth cutting surface, high cutting speed.
3. Good hole cleaning ability.
4. We can design and manufacture according to customer’s requirement of the Bit
Diameter,NO. of air holes,button shape and the face shape.