DescriptionBrand Name : CHEERBRIGHTOrigin : Mainland ChinaDIY Supplies : WoodworkingType : Abrasive BlockCertification : NONEis_customized : YesModel Number : 14100004001is_customized : YesGrit : 3000Square Ruby Size : 100mm*8mm*8mmTriangle Ruby Size : 100mm*9mm*9mm*9mmSemicircle Ruby Size : 100mm*8mmCylindrical Ruby Size : 100mm*8mmEdge Ruby Size : 100mm*5mm*9mmRectangle Ruby Size : 100mm*10mm*5mmClick here for 7Pcs Green Silicone Carbide Oil Stone8015024040060080010001PC 6 Types 3000Grit Ruby Whetstone Kitchen Knife Sharpener Sharpening Graver Stone Oil StoneThe Ruby Sharpening stone is made from sintered crystals of synthetic ruby.It's extremely hard, maintain their shape well and are resistant to wear. Because they are so hard they can sharpen and finish extremely hard metals such as carbide gravers, but also work on non-metal like glass, porcelain and quartz.For sharpening and polishing chilled steel,alloy steel and precision parts etc.These Ruby Sharpening stones can sharpening and polishing for triangle sawtooth, circular saw blade, plane blade edge, small serrated mould.Sharpening stone can use oil or water.Grit: 3000TYpe: 001 square Ruby Size: 100mm*8mm*8mm 002 triangle Ruby Size: 100mm*9mm*9mm*9mm 003 semicircle Ruby Size: 100mm*8mm 004 cylindrical Ruby Size: 100mm*8mm 005 edge Ruby Size: 100mm*5mm*9mm 006 rectangle Ruby Size: 100mm*10mm*5mm1pcs 6 types for choice Ruby Sharpening Grindstone