The X-LOCK X571 Best for Metal Flap Disc offers an excellent lifetime on metal applications. Its high-quality zirconia alumina/semi-friable aluminium oxide grit is tough and wear-resistant for extensive metalwork. The disc's carrier plate is available in angled and straight versions, manufactured from fibreglass material. Use this disc for grinding welding seams and coarse-sanding metal surfaces. Changing flap discs is fast and convenient thanks to the keyless X-LOCK system.