SAIT 22600 Type 27 4-1/2-Inch x 1/4-Inch x 7/8-Inch 13300 Max RPM Z-Tech - Z24R Zirconium Depressed Center Grinding Wheels， 25-Pack<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Z24R Zirconium. Tough zirconium grain. High performance grinding for the toughest applications. Ferrous metals (iron， steel， welds). Stainless steel， high tensile alloys.</li><li>The highest quality zirconium grain.</li><li>All sizes made with uniform grain throughout， no filler grain used.</li><li>Super-Lock Hub on all 5/8-11 threaded arbors in the safest， bibration-free design.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/61RJBEYY8ZL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/318K87430EL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/313tgWr6KtL.jpg" noproxy>