2. When finished the drilling in overburden rock formations, reverse the drilling tools and the wings will get closed, and the drilling tools can be raised from the hole.

3. Next construction can be followed.

Raw Material

Steel:

first class special alloy steel with high strength, heat resistance and wearable

Carbide
The best tungsten carbides from China are commonly applied.
Tungsten carbide from European is also available.

Specification

1. Drill in overburden unstable rock.
2. One step to drill and follow casing
3. Flexible to open or close.
4. Long service life

A	B	C	D	E	F
Outer Dia. of Casing Tube	Inner Dia. of Casing Tube	Reamed Dia.	Min. Inner Dia. of Casing Shoe	Hammer Type	Drill Pipes
mm	mm	mm	mm		mm
114	101-103	125	93	TH79	60
140	124-127	152	113	TH98	76
146	127-132	154	115	TH98	76
168	149-155	184	138	TH122	76,89
178	159-165	194	148	TH122	76,89
193	173-180	206	164	TH139	114
219	199-206	234	185	TH139,TH180	114
244	224-231	273	219	TH180	114

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

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