Check the listing for details. 8" inch Super-Thin Rim 0.3 mm Diamond Saw Blade Cutting Disc Lapidary Tools. Color: Silver, Condition: New. Listed at 18.90 USD. 2Pcs 8" inch Super-Thin Diamond Lapidary Saw Blade Cutting Disc Arbor Hole 1'' inch Rim 0.65 mm Saving in Material for Jewelry Gems Agate Code 200*0.3*25.4 mm Product Specification: Outside Diameter : 8" (200 mm) Arbor hole：1"(25.4 mm) with bushing 5/8”(16 mm) and 3/4''(20mm) Thickness:0.017"(0.43 mm) core thickness / 0.022" (0.55 mm) on the edge where the diamond is. Quantity:Total 2 Pieces 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. 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. 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.