1/4" Granite Core Drill Bits , Diamond Core Bit With 3/8" Shaft

Basic Information
Place of Origin: CHINA
Certification: GB, SGS
Model Number: BGB6.5
Minimum Order Quantity: 50pcs
Price: Negotiate
Packaging Details: paper box, plastic box
Payment Terms: L/C, T/T, Western Union
Supply Ability: 1000pcs per month
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6.5mm Diamond Core Bits for Stone , Core Drill Bit with 3/8" Shaft


Sintered Diamond segment hole saw core drills bit with excellent diamond segments, especially used on rock or marble, granite stone, or concrete (with less than 5mm steel bar). Made for countertop, kitchen or any other stone fabrication applications.


Product introduction.

Outer diameter: 6.5mm (1/4")

Shank: 3/8" shaft.

Segment height: 8.

Segment thickness: 2mm.

Total length: 83mm.

Drill depth: 50mm (2").

Segment type: Crown type.

Suitable: Wet drilling

More durable for industrial or business use.


Details spec.:

Item No. Diameter Segment Dimension Teeth No. Total Length
mm Height Thickness
BGB6.5 6.5 8 2 Crown 83


How dose a diamond core bit work?


A diamond core bit does not cut but works by milling. During the sharpening process performed at the factory, individual diamond crystals are exposed on the face and sides of the segment and it is these that do the milling work. The metal matrix holds each diamond in place. During the work, each diamond is supported by a comet’s tail which strengthens the supporting action of the bond immediately “behind” the diamond crystals.

A diamond tool properly suited to the material to be cut, the equilibrium between the work of the diamond and the abrasion-resistance of the bond is optimum; the diamond is held in place until it is destroyed and new crystals appear. It is in this equilibrium that all the quality of the diamond tool resides.

A core bit intended for cutting hard, dense (less abrasive) materials requires a softer segment bond. This wears out more rapidly, by replacing the worn diamonds relatively quickly so that the blade continues to cut.

Otherwise, for cutting soft, abrasive materials must have a hard, abrasion-resistant segments in order to retain the diamonds longer.



1/4" Granite Core Drill Bits , Diamond Core Bit With 3/8" Shaft 


New packing type:


1/4" Granite Core Drill Bits , Diamond Core Bit With 3/8" Shaft



1) Can you company accept OEM?
We accept OEM orders for all products, as well as buyers' logos.

2) Quality Control?
Each product is strictly checked by of QC dept. We have completed file data in our computer which listed the whole processing of each order. Once the quality of sample order confirmed by clients, we will keep the same formula in the following orders. 15years producing experience, we will bring the most suitable products based on different markets.

3) Shipping Methods?
Air Freight when gross weight is above 45kg and less than 100kg. Fast delivery
Sea Freight when the gross weight is above 100kg. Cheaper freight charge.
Courier (TNT, DHL, FedEx, Ups, etc). Small try order, door to door service.
4) Minimum Order and Delivery?
Minimum order: negotiable.
Delivery: 15 to 45 days. Based on the quantity per order.


Contact Details

WhatsApp : 8618936085316