Patented Product: PDC Composite Combined Chip Drill Bit Origin China Trademark BDM Maximum Flow 1600 HS Code 8430419000 Certification

It is suitable for drilling water wells , geothermal wells , short miscopies ,medium mini-type grouting hole of building , dam and harbor project . 
The Symmetric/Concentric drilling system is designed to drill and case a hole simultaneously through unstable ground conditions. The driver bit incorporated with a satisficial ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, and thus minimizing the disruption of the surrounding of the drill hole. 
The Symmetric Casing Drilling system consists of three parts: central pilot bit, casing shoe and symmetrical ring bit. The central pilot bit drills away the center part of the hole and guides the drill string, incorporated with a sacrificable symetrical ring bit make a full face drill bit.

1. Ring bit and casing shoe assembly is welded to casing prior to drilling. Lock the assembly into pilot bit with hammer. The pilot bit's upper shoulder engages the shoulder of the casing shoe. 
2. Hammer's percussive energy is transferred through the pilot and ring bits, crushing rock . Part of impact energy advances casing. 
3. On completion of drilling and casing , the drill string with pilot bit is retrieved by a slight reverse rotation to unlock the bayonet coupling . The ring bit stays in the hole , and can be recovered only if the casing is retrieved 
4. Drilling continues to the desired depth in the bedrock using a conventional drilling.
 

 Shandong better driling machinery Co..Ltd.  is located in Shandong province. our company main designing and manufacturing the drling rigs which beerwidely used in water wel driling, so samping, getechnical testing, mine exploraton, foundation drling, geothermal drling,etc.  Shandong beter drling machinenCo. Ltd has 19 years experience n manufacturing drling igs and drlig tools. Our products are sold to over 43 countries and reions including Asia Afica.  Europeand South America.  Our factorv has been SO9001 auality svstem and national TUV certification approved. We are dedicating to built trust with customer and findnew was of working not oniy to met customer specic recuirement,but also get their job done more easily, eficienty and economically. Considering the appicationcondition in developing country especialy for that remote area beter drling machinery warmly welcome customers and fiends from al over of the countries to visitmy company and get more and long business cooperation.We always have the constant pursuit of technological innovation adhere to use the high-quality materials to provide the users the most suitable products and the best service.

1. Are you a trading company or a manufacturer?
We are a professional manufacturer. Our factory mainly produces water well drilling rigs, core drilling rigs,air Compressor, down-the-hole drilling rigs, pile drivers, etc. The products have been exported to hundreds of countries around the world and enjoy a high reputation all over the world.
2:Where is our factory?
Our factory is located in Linyi City,Shandong Province, China.
3: Do you have after-sales service?
Yes.We provide 18 months free warranty and free technical support for the whole life of any machine. During warranty period, if parts still broken, we can send the new ones freely.
4.How is the quality of your machine?
Our products pass strict quality inspections before they leave the factory to ensure that they are qualified before they are shipped.
5. How to inspect the goods?
1) Support customers to come to the factory for on-site inspection.
2) Support customers to designate third-party companies to inspect goods.
3) Support video inspection.
6. How about quality assurance?
We provide a one-year quality guarantee for the main machine of the machine.
7. How long is your delivery?
1) In the case of stock, we can deliver the machine within 7 days.
2) Under standard production, we can deliver the machine within 15-20 days.
3) In the case of customization, we can deliver the machine within 20-25 days.