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Quick Details

  • Place of Origin: Fujian, China (Mainland)
  • Brand Name: SUNNY
  • Model Number: SYLM-81
  • Type: Core Drill Bit
  • Material: Diamond
  • Use: Masonry Drilling
  • Machine Type: Drill Machine; Hand-held Drill
  • Working Length(mm): 60 - 500
  • Diameter(mm): 60 - 400
  • Connection: M14;5/8''-11;G1/2'';Straight Shank
  • Use Condition: Wet;Dry Used
  • MOQ: 1PC
  • Color: Upon Request
  • Manufacturing Arts: Welding
  • Production Capacity: 8000 PCS/Month

Packaging & Delivery

Packaging Details inside in sponge, outside in cartons or wood case
Delivery Time 7 - 15 day


1.High efficiency and long lifespan
2.Low energy consumption
3.Accuracy operation
4.Competitive price
5.Safety operation

 Diamond Drill Bits Recommended Drill Head Pressure

                      Material                 Drill Head Pressure 
Glass & FiberglassNot Recommended
Limestone & Marble Stone15 to 20 lbs.
Ceramic/Porcelain Wall Tile15 to 20 lbs.
Porcelain Floor Tile20 to 30 lbs.
Granite & Quartz Stone30 to 40 lbs.



     Drill press arms leverage hand pressure by a factor of about 6 to 8.  So 2 lbs. of hand pressure on the drill press arm will apply about 12 to 16 lbs of pressure at the drill head. 
      If a drill bit develops yellow, brown, blue or black 'burn marks' around the tip, it is an indication of extreme heat caused by the excessive drill speed or by too much pressure on the drill.  Impact type "hammer drills" should never be used with diamond drills as they have no benefit and will cause the tip of the bit to mushroom or split.   

    If a hole is being drilled completely through a piece of material, it is also important to "lighten up" considerably on the pressure when the drill bit is near the back of the material.  This reduces chipping or fracturing on the back of the material when the bit emerges from the back.



Balancing Cutting Speed, Drill Speed, Pressure and Lubrication


   The cutting speed and life of a diamond drill bit are affected by the hardness and abrasiveness of the material plus the drill speed, pressure and lubrication.  Experience with a specific material quickly allows a person to determine the optimum drill speed, pressure and lubrication to obtain the fastest cutting speed with the least affect upon bit life and risk of heat fractures or breakage.  However, lacking experience, it is best to start out with a very slow drill speed, very low pressure and lots of lubrication.  This starting point reduces risks to a minimum and extends bit life considerably.














































Company Information





1. TT, western union, Money Gram and PayPal

2. 100% payment before delivery

3. To the Bulk order, the L/C is also can consider


Delivery time:  Within a week after payment

Transport ways choose:

1. Urgent order with less weight or samples SUNNY recommend express service.
2. Normal (regular) orders which weight over 45kgs SUNNY recommend Air Cargo.
3. Big diameter saw blades or heavy weight SUNNY recommend Sea Cargo.

For expert advice, regarding questions about our company or concerns SUNNY products

(diamond tools) please contact us through e-mail or link on: sunnytools.en.alibaba.com/company_profile.html


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Trade Assurance
China (Mainland) | Manufacturer, Trading Company
Transaction Level:
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10 Transactions 10,000+
The supplier’s transactions conduted via Alibaba.com in the past 6 months.
The supplier supports Trade Assurance – A free service that protects your orders from payment to delivery.
Supplier's Trade Assurance Limit: US $300,000
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