Description: Long-lasting WinnerFlex Coned Flap Discs with zirconium are perfect for stainless steel and can also be used with mild steel. No backing pad needed with angle grinder. Overlapping design ensures extended lifespan compared to regular sanding discs. Expertly crafted for efficient and precise sanding. Spec: Diameter: 125mm Bore / mm: 22.23 Grit: 60 Vmax m/s: 80 Max RPM: 13,300 Structural Shape: convex Grain Zirconia alumina