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Zirconia Alumina a sharp and long-lasting material that works well on a wide variety of heavy grinding operations for general use including blending welds, removing machining marks, sanding mild contours and flat surfaces. Type R: Features a roll-on/roll-off style fastener with External Thread equivalent to Norton's TR or 3M's Roloc fastening systems. Quick change screw fitting ensures that the disc is always perfectly centred without adhesive, moving parts or centre screw damage to the work piece. Available in 25mm, 38mm, 50mm and 75mm diameters. Select from 13 Variants