DA Backing Plate - 5Meguiar's DA backing plates are designed to distribute pressure evenly for smoother sanding and finishing. The outer edges are precisely tuned for disc contouring over flat and curved surfaces. These backing plates also features a rotation indicator marking that allows the user to recognize backing plate rotation for ideal results. Can be attached to all DA polishers with a 5/16 diameter shaft.Features:Distributes pressure for smoother sanding and finishingPrecisely tuned outer edges for ideal pad & disc contouring over fl at and curved surfacesQuick and easy pad & disc changes with micro hook and loop attachment systemFits all DA Polishers with 5/16 diameter shaft