Scotch-Brite(TM) Clean and Strip Disc D1, 4 in x 1/2 in x 1/4 in S XCS, 10 per case Tough, rigid clean and strip disc on a 1/4 inch shank for portable tools. For maintenance applications, cleaning, conditioning. Safe alternative to wire wheels and scrapers. Abrasive mineral: Extra coarse grade silicon carbide. Color: Gray MOS: 8000 RPM