DOWN THE HOLE drilling is a kind of big diameter borehole drilling by extending the impacting power to the bottom of the hole. With high straightness, clean hole wall, good rigidity of drill pipe and hammer, without high axial thrust, no restriction of drilling depth and low cost, DTH drilling tools are widely used in open-pit mining.
Eccentric casing Systems
Drilling through formations with loose, unconsolidated material always comes with problems such as the bore hole cave-in collapse. How to avoid these problems? With years of field practice and research, Team whole had developed its eccentric casing system application for strata with silt, sand or small size pebbles. With its simple structure,easy operation and reliable performance, this system can advance the casing easily for depth within 30 meters. And it's retrievable with long service life.
Concentric Casing Systems
Usually the land surface of the earth is covered with loose, unconsolidated material such as soil, clay, silt, sand, gravel and boulders, which varies in depth from a few centimeters to hundreds of meters. Use concentric system can drill this complex formation very well. The systems are available through the whole product range the smallest being for 114 mm (4 1/2") casing and largest size available at the moment is for 1220 mm (48") casing.
Maxdrill Cheap Price Hot Sale Rock Tools R32 45mm Thread Button Bit for Drilling Mining and Quarrying
Product Description
Dimensions  Flushing hole(mm) Buttons(mm) Angle Class Part No
mm in Front No Size Gauge No Size Front No Size Gauge No Size
45 1 3/4 3*5 1*5 3*8 6*10 30 ° - 3045R32F09
48 1 7/8 3*5 1*5 3*9 6*10 30 ° - 3048R32F09
51 2 3*5.5 1*5.5 3*9 6*10 35 ° - 3051R32F09
54 2 1/8 3*6 1*5.5 3*10 6*11 35 ° - 3054R32F09
57 2 1/4 3*6 1*6 3*10 6*11 35 ° - 3057R32F09
Remarks:
Hemispherical-66(Usually for very hard rocks)
Ballistic-65(Usually for medium hard rocks)
Semiballistic-64(Usually for medium hard rocks)
Conical-67(Usually for soft rocks)
FAQ
The information you may like to know before order:
1. Â Methods of Payment:
  T/T (Telegraphic Transfer) or Western Union or L/C at sight
2. Â 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. Â 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. Â Quality Control
  We have our own experienced QC.
  There will be strict inspection and testing for every order before shipping out.
5. Â After Services:
  a. Our sales team will response for your question within 24 hours (Holidays Excluded)
  b. Technical Support will be available in any time
  c. Free replacement will provide once the failure confirmed caused by our product quality
Maxdrill High Performance Hot Sale Rock Tools T38 64mm 12 Tips Drop Center Retrac Skirt Thread Button Bit  Â
Product Description
Dimensions D Flushing hole(mm) Buttons(mm) Angle part no.
mm in Front No Size Gauge No Size Front No Size Gauge No Size
64 2 1/2 2*9 2*6 4*10 8*10 30 ° 3064T3812R
70 2 3/4 2*8 2*6 4*11 8*11 35 ° 3070T3812R
76 3 2*9 2*7 4*12 8*12 35 ° 3076T3812R
89 3 1/2 2*11 2*8 6*12 8*13 35 ° 3089T38F14R
64 2 1/2 3*7 1*6 4*10 8*10 35 ° 3064T3810DR
Â
Remarks:
Hemispherical-66(Usually for very hard rocks)
Ballistic-65(Ususally for medium hard rocks)
Semiballistic-64(Usually for medium hard rocks)
Conical-67(Usually for soft rocks)
Process &Packaging
FAQ
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
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:
  a. Our sales team will response for your question within 24 hours (Holidays Excluded)
  b. Technical Support will be available in any time
  c. Free replacement will provide once the failure confirmed caused by our product quality
Drag bit is a drill bit usually designed for use in soft formations such as sand, clay, or
some soft rock. However, they will not work well in coarse gravel or hard rock
formations. Uses include drilling water wells, mining, geothermal, environmental and
exploration drilling. Whenever possible, they should be used to drill pilot holesbecause they produce cuttings that are easiest to log.
TOP HAMMER drilling tools include: bit, rod, shank and sleeve. The piston of drill rig directly impacts the shank, makes impact power reach the bit through rod by the form of stress wave, so as to work on the breakage of rock. The primary breaking way is impacting while the secondary is cutting; both are with high drilling efficiency.
Product Despcription
Maxdrill self-drilling anchor embodies drilling, grouting and anchoring as a whole.
Widely used as an efficient anchoring means, in tunnel pre-support, slope, coast, mine, water conservancy projects, building foundation, roadbed reinforcement and geological diseases treatment such as landslip, crack, sink age. It's irreplaceable in narrow construction environment.
Product Despcription
Maxdrill self-drilling anchor embodies drilling, grouting and anchoring as a whole.
Widely used as an efficient anchoring means, in tunnel pre-support, slope, coast, mine, water conservancy projects, building foundation, roadbed reinforcement and geological diseases treatment such as landslip, crack, sink age. It's irreplaceable in narrow construction environment.
Maxdrill self-drilling anchor embodies drilling, grouting and anchoring as a whole.
Widely used as an efficient anchoring means, in tunnel pre-support, slope, coast, mine, water conservancy projects, building foundation, roadbed reinforcement and geological diseases treatment such as landslip, crack, sink age. It's irreplaceable in narrow construction environment.
