ABN 3&rdquo; T27 80 Grit High Density Zirconia Alumina Flat Flap Disc Roloc Roll Lock Grinding Sanding Sandpaper Wheels 10 PK 3 80 Grit Zirconia Alumina Flat Flap Disc Roloc Lock Grinding Wheels, Designed for use on stainless steel and aluminum as well as many other surfaces. Ultra-performance zirconia alumina with abrasive for extended disc life and a super aggressive cut. Zirconia alumina self sharpens to extend disc life while also providing more cutting power than aluminum oxide discs. Durable fiberglass back is lightweight, but also offers extra strength and absorbs tool vibration. Disc is semi-open to retard loading on aluminum. Size: 3&#034; Grit: 80