Grit 3000 Rectangle Knife Sharpening Grindstone Whetstone Polishing Stone _x000D_ Sharpening Grindstone Grit 3000# Ruby Whetstone Oilstone Graver Sharpening Tool 150mm/6-inch Length Stone Block _x000D_ _x000D_ Grit #3000 Rectangle Ruby Knife Sharpening Grindstone Whetstone Polishing Stone Oil Stone_x000D_ _x000D_ _x000D_ Features: _x000D_ _x000D_ _x000D_ new and high quality._x000D_ _x000D_ The Ruby Sharpening stone is made from sintered crystals of synthetic ruby._x000D_ _x000D_ 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._x000D_ _x000D_ For sharpening and polishing chilled steel,alloy steel and precision parts etc._x000D_ _x000D_ These Ruby Sharpening stones can sharpening and polishing for triangle sawtooth, circular saw blade, plane blade edge, small serrated mould._x000D_ _x000D_ Sharpening stone can use oil or water._x000D_ _x000D_ _x000D_ Specifications: _x000D_ _x000D_ _x000D_ Color: red_x000D_ _x000D_ Size: 150mm/5.91"20mm/0.79"5mm/0.20_x000D_ _x000D_ Grit: 3000#_x000D_ _x000D_ _x000D_ Note: _x000D_ _x000D_ _x000D_ Transition: 1cm=10mm=0.39inch_x000D_ _x000D_ Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid._x000D_ _x000D_ Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!_x000D_ _x000D_ _x000D_ Package Includes: _x000D_ _x000D_ _x000D_ 1 Sharpening Grindstone_x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_