JINGLING 8" 200mm Notched Rim 1.2mm Diamond Lapidary Rock Saw Blade 5/8 " Slab For Gemstone Code ZYP-200-0.8-16 This is a brand new lapidary rock saw blade with 5/8" arbor hole Product Specification: Product Name: 8 inch lapidary saw blade, lapidary trim saw, 8" gem saw Outer Diameter: 8" (200mm) Arbor hole: 5/8" (16mm) Can be used on 1/2"(12.7mm) arbor with a bushing Core thickness: 0.035" (0.9mm) Rim thickness: 0.047"(1.2mm) at notched rim where diamonds are Recommend RPM: 1910 RPM Use with light oil or water as a lubricant This blade will perform well on most types of hardness rock It has held up extremely well and cuts just about most kind of rock, from the very soft petoskey stone fossils to hard jasper, petrified wood, geodes ​We don't recommend using this blade to cut too hard materials, such as: agate with a Morse hardness of 6-7. Because it is difficult to cut or the blade will be damaged quickly A high concentration diamonds are crimped into the blade rim More diamonds in the notched rim and a stiffer core make this blade cut faster and provide a long use-life These blades work well with most lapidary materials and are a very affordable alternative to name brand blades 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