Atoplee 6pcs Grit 3000# Ruby Sharpening Grindstone Whetstone Graver Sharpening Tool 6 Shapes [Square/Triangle/Semicircle/Cylindrical/Edge/Rectangle]<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>The Ruby Sharpening stone is made from sintered crystals of synthetic ruby.</li><li>They are so hard that they can sharpen and finish extremely hard metals such as carbide gravers.</li><li>They can also work on non-metal like glass， porcelain and quartz.</li><li>Suit for triangle sawtooth， circular saw blade， plane blade edge， small serrated mould.</li><li>For sharpening and polishing chilled steel， alloy steel and precision parts etc.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41b9z4MBZqL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/313lqGR6RcL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31pHnhIUg0L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31KlIjGkJjL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31jv9%2BoQMfL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31UQPm1e0dL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31hPeLGI%2BZL.jpg" noproxy>