See the complete line of Mercer Flap Discs. Designed to grind and finish in one easy step. No matter what the material – stainless steel, metal, or alloy – Flap Discs leave a smooth finish. They last longer, are easy to use and deliver quality grinding, deburring, rust removal and weld seam blending. Zirconia, Ceramic and Aluminum Oxide discs are available in a wide range of sizes and grits to meet the most demanding job requirements