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Quick Details

  • Place of Origin: Fujian, China (Mainland)
  • Brand Name: BESTLINK
  • Model Number: HOD
  • Type: Drill Bit
  • Machine Type: Drilling Tool, Drilling Equipment
  • Certification: API
  • Material: Carbon Steel
  • Processing Type: Forging
  • Use: Well Drilling
  • Compatibility: COP/SD/DHD/CIR/QL
  • Application: mining/Quarry/Construction/Water well drilling
  • certificate: API,ISO9001:2008,CE
  • Key word: Drill Bit

Packaging & Delivery

Packaging Details: Packing details:
Bits: Single carton inside with bubble or covering layer, again with wooden case outside, or as per your request
Hammers: Single wooden case outside but with bubble covering layer inside.

 Eccentric drilling tool/Eccentric Overburden Drill Bit


( 36 years manufacturing experience; Certificate: ISO9001:2008 )

Eccentric overburden drilling tools with casing tube (HOD series): 


Product Description

 Eccentric Reamer System Step-by-step  

1. When drilling starts, 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 drill string.


Application Range 

This product is made of alloy of high quality and apply for advanced high-frequency welding technology and maturity of heat treatment process, greatly improving the intensity, wear resistance and impact toughness of cutter head, increasingly prolonging the working life, enhancing the drilling efficiency.

It is recommended to drill in rock formation where contains some ovals and fractures. 


Design Principles

 Make the casing follow easy and the equipment and operation simple 


Outstanding Advantages

The stable and reliable working performance and the less vibration of drill rig and flexible to open and close.

Order Guide:  product type.


Specifications                                                                                             unit:mm 





Factory and workshop




Products process

Materials: Tungsten carbide and high strength alloy steels. 

Processing: CNC milling and proprietary "hot (thermal) -insertion" processing procedure to insert the buttons as same as internationally well-known brand ,military grade requirements of heat-treatment guarantee durability .

01.Raw materials cutting 


03.Numerical control operation 

04.Through rough finish 

   Turning/spines mining 

05.Heat treatment (8hours) 

06.Button bits fitting 

07.Fine finishing 

08.Quality test; 

09.Finished products 

10.Packing and transportation

In order to quote you the best price, please tell us the details as following:

01.Grade and specification or drawings;

02.Quantity and quality level;

03.Operation environment;

04.Other special requirement. 




Packaging & Shipping

 Packing details can be customized as per your requirement

Timely shipment can be made upon our negotiation





 The information you may like to know before order: 

1. Methods of Payment:

  T/T (Telegraphic Transfer) or Western Union or L/C at sight,onetouch.cn,Escrow,Paypal 

2. Handling time for an order

  Based on order quantity, normally it takes 25 days for production.

  Only 2 or 3 days if we have stock on your request size.

3. Shipping way

  Sample order: we suggest Courier express like DHL/UPS/TNT/FEDEX or by air

  Bulk order: we suggest by air or by sea.

4. Quality Control

  We have our own experienced QC.

  There will be strict inspection and testing for every order before shipping out.

5. After Services:

  1. Our sales team will response for your question within 24 hours (Holidays Excluded)

  2. Technical Support will be available in any time

  3. Free replacement will provide once the failure confirmed caused by our product quality 

In order to quote you the best price, please tell us the details as following:

01.Grade and specification or drawings;

02.Quantity and quality level;

03.Operation environment;

04.Other special requirement. 



 About Us:

1. Our factory has been specialized in manufacturing drilling tools and spare parts since 1980.

2. We have advanced technology and equipment.

3. Our technician has more than 36 year’s professional working experience.

4. Rock drilling tools are exported throughout the world. Main market: Brazil, Chile, Colombia, Uruguay, Australia,Ukraine,Russia, ,Norway, Turkey, USA,Canada, Iran, Malaysia, Thailand, India, etc. 

5. We accept OEM manufacturing and produce on your design.







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