[MATERIAL USED ON] Green 50# grit Yellow 80# grit - Used on hard metal like steel. grey120# grit - Used on soft metal such as aluminum. Various grit meet your different needs. [WIDE USAGE] Use for deburring, blend, finish, clean, and remove coatings more effectively, with less pressure than wire brushes. [EXCELLENT QUALITY] Flexible bristles require less pressure than wire brushes, provide more contact than wire brushes, and maintains abrasive property throughout the life of the disc. [DIAMETER] Diameter: 2 Inch. Come with 1/4Inch Shank Attachment. [COMPATIBILITY] can be used with most multi-function tools, such as electric drill, mini grinders, and rotary tools. Recommended for rotate speed between 15,000-25,000rpm., Weight: 0.6503636729 pounds, Manufacturer: Teuypty