5Pcs 6" inch Super-Thin Diamond Lapidary Saw Blade Cutting Disc Arbor Hole 5/8" Rim 0.4mm Saving in Material for Jewelry Gemstone Code 150*0.3*16 Product Specification: Product Name: 6 inch diamond saw blade, 150mm diamond blade, Lapidary diamond saw Outside Diameter : 6" (150mm) Arbor hole : 5/8"(16mm), can be used on 1/2"(12.7mm) with a bushing Thickness: 0.012"(0.3mm) core thickness / 0.016" (0.4 mm) on the edge where the diamond is Quantity: 5Pcs Recommend RPM: 2550 RPM 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 4-7 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 The blade needs to be flattened. The circle imprint of blade is the trace flattened process Welcome to Visit Our Store: www.amazon.com/shops/DiamondTools30