Weiler 1-1/8″ Nickel-Plated Cup Crimped Wire End Brush features a solid end construction and very flexible brushing action. ideal for more demanding light-duty cleaning applications in corners and hard-to-reach areas. 1/4″ stem diameter for use on die grinder and right angle die grinders. Hollow end and heavy duty brushing action with some flexibility. Ideal for more demanding cleaning applications in recessed areas. For use with die grinder and right angle air die grinder power tools. Nickel plated cut. .