TILAX Knotted Twist Wire Wheel for Grinders, Suitable for Heavy Cleaning Rust, Stripping and Abrasive.Parameter Color: red / silver Material: high carbon stainless steel wire Diameter: 4 Inch Wire diameter: 0.020 Inch Thread standard: 5/8 Inch-11 Threaded Arbor Load speed: 12,500 RPMFeature 1: Angle grinder wire wheel brush's external and internal fixing plates are made of thick steel and 10 grades of large hexagonal threads for safety and stability. 2: 0.020in high-strength hardened carbon steel wire and perfect knotting integrity for longer life, safety, smoothness and ease of use. 3: The twisted wire brush operates at speeds up to 12,500 RPM for easy removal of severe corrosion, rust, paint, splashes and scale while cleaning the edges of the weld and removing burrs.Precautions 1: Please wear protective equipment before operation. 2: Avoid operations beyond the rated range.