178mm x M14 Twist Knot Wire Wheel Brush Size: 178mm (7") Diameter Thread size: M14. Material: Twist Knot Steel Wire   Max rpm: 12,500 Pack quantity: 1 Heavy-duty twist knot wire brushes are ideal for fast aggressive removal of rust, scale, and paint also cleaning and preparing of metal surfaces. These brushes are supplied with a M14 female thread and will fit most 180mm and 230mm angle grinders.