Norton Clipper Wire Brushes and Wheels provide a pristine and professional performance for cleaning and deburring on various surfaces including steel, ferrous metals and stainless steel This wire cup brush is designed with a specialized stainless steel wire that pairs best with iron, carbon steels, metals and wood Ideal for heavy jobs with a medium coarse wire diameter, while a cup design will cover large surfaces more efficiently Twist Knot wire brushes such as this one are built with straight wire filaments that twist together to create a rigid rope design, ideal for aggressive applications that require higher impact Cup size is 3 inches and will operate up to 15,000 RPM. Comes as a pack of 1