6 DA Backing PlateMeguiar's DBP6 DA Backing Plate 6, with precisely tuned outer edges for ideal disc contouring over flat and curved surfaces, distributes pressure for smoother sanding. and finishing. Disc changes are quick and easy with micro hook and loop attachment system. Fits all DA Polishers with 5/16 diameter shaft. Features:Distributes pressure evenly for smoother sanding and finishingPrecisely tuned outer edges allow you to navigate the curves and contours of any vehicle with more consistencyQuick and easy disc changes with micro hook and loop attachment systemFits all DA Polishers with 5/16 diameter shaftRotation indicator marking allows user to recognize backing plate rotation for ideal results