158899 Grit Size: 150 Features: -Vitrified Polishing Discs.-Flexible, Hook and Loop backed discs for light shaping, smoothing, and initial polishing of granite or marble.-Max 3700 RPM.-Diameter: 4". Color/Finish: -Item # 158898 - Grit: 60, Color: Blue.-Item # 158899 - Grit: 150, Color: Yellow.-Item # 158900 - Grit: 300, Color: Orange. Dimensions: -Weight: 1 lbs.