BlueSpot Segmented Gold Diamond Dry Cutting Discs are specially designed to provide fast and accurate dry cutting. Ideal for use with many materials including roof tiles, high density concrete kerb stones, slabs, pipes and bricks. High resistance to breakage and long lasting durability. Suitable for all makes of angle grinders. Diameter: 115mm (4 1/2″) / Bore: 22.23mm. Maximum safe speed:13000 RPM (80m/s). MPA Tested/EN13236.