10Pcs 4" inch 100mm Super-Thin Diamond Lapidary Saw Blade Cutting Disc Rim 0.3mm for Gemstone Code 100*0.3*12.7mm
Product Name: Lapidary saw blades, Gem stone cutting saw
Outside Diameter: 100mm (close to 4")
Arbor hole: 1/2" (12.7mm) 
Core Thickness: 0.012"(0.3mm) 
Rim Thickness:  0.016" (0.4mm) on the edge where the diamond is
Quantity: 10Pcs 
Recommend RPM:  3820RPM
Product Description:
Exclusively designed for processing materials for softer high value rocks like turquoise, gaspeite, opals.
These blades are manufactured by crimping synthetic diamonds directly into the edge of the saw blade. They are best suited for turquoise, opal, glass, and stones in the 4-6 range on the Mohs hardness scale.
We don't recommend using this blade to cut too hard materials, such as: agate and jadeite with a Morse hardness of 6-7. Because it is difficult to cut or the blade will be damaged quickly
Advantages: achieving satisfactory cutting results and reducing unnecessary material consumption
This thin diamond lapidary saw blade offers a very good cost effective option for those that want either very thin kerfs or plan on short term use.
Used for Trimming: They are excellent for trimming small shapes into stones
This simply means that these blades are meant for small material, not large or slabbing techniques. Also, these blades operate in a single direction so make sure that the arrow on the blade is pointed towards you when mounting.
Use with water as a lubricant
The water is required to cool and lubricate when cutting process. If there is not enough water to cool, the diamond at the front of the saw blade will quickly wear off because of high temperature
New, Unused Blade - Not in Original Packaging
These blades were originally packaged in oil so you will see several oil spots on the surface.
We will send out your order within 1-2 days after payment has been received and cleared. 
Please let us know if you are looking for other accessories or hardware
We can provide any size (Outer Diameter 2-3/8 to 10 inch; 60/85/100/110/150/180/200/250mm) & amount of this product