4" Encapsulated Stringer Bead|4" .020, 5/8"-11 A.H. , ENCAPSULATED STRINGER BEAD WHEEL - features a 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. Suitable for cleaning hot welds. 5/8"-11 nut for use on right angle grinders.