Vacuum Brazed Diamond Drum Wheels have a good cutting effect and the long wokring life. Applications on stone materials and having water cooling hole at the center so as to apply for wet use 1. Much better performance than sintered. 2. It is manily used for milling groove of the inner side of stones. 3. With special diamond technology, diamond is firmly brazed onto the center, which makes its cutting effciency higher. 4. Work life longer, cost lower and performance higher. 5. Other diameter are inquiry by customer.