These twist-knot wire cup brushes are designed for heavy-duty work and delivers aggressive stock removal on ferrous metals. The bristles are made from hardened steel wire, which gives a high level of durability and performance. The twist-knots are tight for a longer life and the twisted construction is perfect for quicker material removal in deburring and cleaning tasks. The cup shape works flat to the surface to cover a large surface area. Compatible with most angle grinders with an M14x2 connection.