Weiler 6″ Polyflex Encapsulated Root Pass Weld Cleaning Brush features heat stabilized black elastomer that gradually wears exposing consistent short trim for maximum aggression and long life. Ideal for applications on flat surfaces that require maximum aggression but no flexibility in the brushing action. 5/8″-11 threaded nut for use on right angle grinders. Heat stabilized black elastomer gradually wears exposing consistent short trim for maximum aggression and long-life. Ideal for applications on flat surfaces that require maximum aggression but no flexibility in the brushing action. 7/16 in thick at face plate. . .