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1.for 406mm casing drilling for foundation or water well, 2.low cost permanent ring bit set, 3.low torque,large power,high speed - details see: https://www.machineto.com/406mm-dth-symmetrix-overburden-casing-atlas-copco-style-drilling-equipment-10098489

Usage:

1.In not stable rock formation, the casing is necessary to follow.

2.Usually in foundation or water well drilling, for large hole boring.

3.drilling depth is betterless than 40 metresto control the hole well.

larger depth is also available with other designs.

4.match to 12" hammer and 406mm casing tube.

5. air pressure is 25 Bar and air volumn is 1500 cfm.

6. the ring bit is left in the hole.

Adavantage

1. the concentric design is more reliable and less torque than the eccentric.

2. large impact power to make high speed drilling.

3. straighter hole.

4. easy to follow the casing.

5. reverse rotation and withdraw the pilot bit to use it for next holes.

Recommend air compressor

Ingersoll Rand, Sullair, Atlas Copco

Recommend hammer and bit

Package

Ply-wooden case with dimension 95cm*53cm*53cm and weight 290KG/Set.

Quality Warranty

The company is responsible for any problem caused by defaulty of material and maching.

The broken parts will be replaced at the sight of photos and product serial code.

Payment Term

30% at the order and full payment at the sight of shipping advice.

Delivery Time

in 25 days after receiving the deposit payment.

How to complete the whole deal

Step:

1. Firstly decide the design, material and color

2. Decide the size in accordance with client's requirement and our

recommendation

3. We will give the best offer.

4. Client's accept the offer and we send proforma invoice.

5. Client transfers 30%-50% deposit and production begins

6. After production, we will send ready products photo

7. After client's confirmation, we will arrange shipment, and send

copy shipping documents like B/L, commercial invoice and

packing list

8. Client transfer balance payment and we will send original

documents by DHL or EMS