219-DHD360 Eccentric Tube Drill Bits For Tunnels Factory Direct Sales Quality

Eccentric casing System

Hardening treatment of the part’s surface：with longer operating life and excellent anti-wear properties. 

Structural optimization：Strengthen the structural strength, easy to operate

Superior performance：Stable and reliable performance, high drilling speed 

Working Principle of Drill:

1.When start drilling , the reamer swings out and reams the pilot-hole wide enough for the casing tube to slide down behind the drill bit assembly.

2.When the required depth is reached, rotation is reversed carefully, whereupon the reamer swings in. Allowing the drill bit assembly to be pulled up through the casing.

3.Casing tubes that are to be left in the drill hole should be sealed at the bottom of the hole by means of cement grout or some other sealing agent.

4.Drilling continues to the desired depth in the bedrock using a conventional drilling.

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

Q: What is your mode of payment about Eccentric Tube Drill Bits?

A: For Air Cargo the payment should be T/T(Telegraphic Transfer through bank) of total amount before shipment, for Sea Cargo other terms to be negotiated.

Q: We send you the payment, what we should do if you don’t send us our order?

A: This is impossible to happen! But if you send us the payment, please inform us or send us the copy of Bank Transfer so that we can make the production and arrangement of shipment earlier.

Q: If we make the payment, how long you will make the shipment?

A: It depends on the quantity of order, as usual we make the shipment within one week on receipt of payment. For special order(Such as big order or not standard specification order) it may cost more days. We always let our customers know how many days(approximate) he should wait before or after he place an order.

Q: What is the delivery way about Eccentric Tube Drill Bits?

A: For order we always make the shipment by Air, also we can make the shipment by SEA, it depends on our customers’ requirement. As usual by Air it only costs about 5-10day the cargo can arrive in destination Airport from the shipping date. By Sea it will cost about 30days, this is not suitable if people need the goods urgently. Also, we can make the delivery by Courier, but the charge is very high.