Wolverine 1″ Knot Wire End Brush features hollow end construction and heavy duty brushing action. Ideal for more demanding cleaning applications in recessed areas. 1/4″ stem diameter for use on die grinder, drill and drill presses. Hollow end construction and heavy duty brushing action. Engineered to provide cost-effective use for less demanding applications. For use with die grinder, drill and drill press power tools. Ideal for more demanding cleaning applications in recessed areas. .