Weiler 1/2″ Controlled Flare Crimped Wire End Brush is a uniquely trimmed crimped wire fill for more effective brushing action and greatly enhanced durability when cleaning corners and filet welds. 1/4″ stem diameter for use on die grinder and right angle die grinders. Uniquely trimmed crimped wire fill for more effective brushing action. Greatly enhanced durability when cleaning corners and filet welds. 2000 rpm maximum speed. . .