1)Bao xing
2)Be applicable to drill in orbicular stratum
3)high quality and lowprice

1)Bao xing
2)Be applicable to drill in orbicular stratum
3)high quality and lowprice

4)The 737 can be used to drill hard and abrasive formations.

5)Wear-resistant tungsten carbidee inserts are used in the outer rows to prevent loss of bit gauge.

6)Maximum nimbers of hemispherical-shaped inserts are used in all rows to provide cutter durability and long life.