Precise Size:5-13/16 inch diameter, 3/8 inch wide, 1/2 inch bore Double-sided Design:This CBN disc adopts an upgraded double-sided design. One disc has two different grit sizes to meet your different needs and save time in changing discs Absolute Balance:Our CBN grinding wheels are tested before leaving the factory. The surface will not vibrate during grinding, and the inner hole size is accurate, which can perfectly match your machine Superior Performance:CBN sharpening disc can be used to process various tools, making them sharp again and getting a smooth surface Widely Used:The 1/2-inch inner hole size can be installed not only on the WS3000, but also on your 6-inch bench grinder. And the CBN does not need to be trimmed after use. After the abrasive is used up, it can continue to be used with sandpaper or other abrasive tools