7 Buttons 42mm Hard Rock Drill Bits Long Service Life Time

7 Buttons 42mm Hard Rock Drill Bits Long Service Life Time

1.Button:tungsten carbide button is the key of the tapered drill bits.our tungsten carbide button is manufacture by ourselves . tungsten carbide grad JZ05 JZ15X JZ8 JZ8X for you different rock condition.

2.Steel :42CrMo alloy steel which with Vacuum heat treatment to improve the hardness of the steell body.we also can customization for different alloy steel according your application

----------------------------------------FAQ-----------------------------------------

Q: The advantage of hard rock drill bits?

A:With carbide buttons hot pressed on the bit skirts,tapered button bits have a good drilling performance and are excellent in longevity.

Q: Which Express company you send? How many days we can receive the hard rock drill bits?

A: We are official partner of TNT, UPS, DHL, Fedx. it will take only 3-5 days after we sent the products of hard rock drill bits for you.

Q: How long you can reply me if i send an inquiry of hard rock drill bits?
A: We promise to reply within 24 hours( including holidays) after received your inquiry about hard rock drill bits.

Q: Can you offer us the hard rock drill bits with free samples?
A: Normally we do not offer free samples, but we could properly adjust according to detailed requirement.

Q: Where are the hard rock drill bits applied to?

A: Mine, tunnel,slope,foundation pit.