BlueSpot Metal Grinding Discs are specially designed to provide highly efficient grinding. Ideal for use with normal steels, alloy steels and non-ferrous metals. High quality grinding disc with high resistance to breakage and long-lasting durability. Suitable for all makes of angle grinders.Specially designed to provide highly efficient grindingIdeal for use with normal steels, alloy steels and non-ferrous metalsHigh quality grinding disc with high resistance to breakage and long lasting durabilityDiameter: 115mm (4 1/2") / Bore: 22.23mm / Thickness: 6mmMaximum safe speed: 13300 RPM (80m/s).