APEXX Brazed CNC Sink Drum. DIAMOND DIAMETER: 2" DIAMOND HEIGHT: 2". GRIT: Fine #200. MATERIALS: ES, Granite, Quartzite, UCS. SUGGESTED RPM: 5,000 -- 6,000. FEED RATE: 500 -- 600 mm/min. Built with high-standard vacuum brazing technology and premium diamonds; Super fast and clean grinding on almost any stones; The diamond layer will always stay straight and will never lose shape; Last a lot longer than electroplated wheels; The best solution for cleaning up the inside of sink holes; Standard 1/2"Gas thread; Material: Engineered Stone, Granite, Marble, Limestone, Quartzite, UltraCompact Surface; Wet use only.