Outstanding lifespan - The X571 Best for Metal offers excellent durability when grinding weld seams and rough-surfaced materials. Its grinding surface is made from high-quality zirconium oxide-reinforced semi-precious corundum grain, making it robust and wear-resistant for extensive metal work. The product is designed for metal applications. The X571 Best for Metal is compatible with angle grinders. The full synthetic resin bonding of the grinding grains on the X fabric ensures wear resistance and a long lifespan even under heavy use. The backing plate is available in both angled and straight versions, made from fiberglass or plastic, with a 22.23 mm hole diameter for standard angle grinders with a clamping nut.