Norton® NORZON® NZ24-UBXR1 24 Grit 1/2" X 2" Zirconia Alumina Resin Bond Mounted Points are used for removing parting lines, fins and small risers from castings, smoothing and blending or welded areas. W189 Mounted point with 1/4" spindle Dia and 24000 RPM lasts 4 times longer and faster stock removal than competitive aluminum oxide products.