SANDWOX Interface Pad is specially designed for use with 768 Superfine Sanding Discs in fine sanding and finishing applications. Positioned between the backup pad and abrasive disc, its soft and flexible foam construction provides extra cushioning and excellent surface conformity, helping the abrasive follow curves and contours more evenly. It reduces the risk of deep sanding marks and uneven pressure, delivering a finer, more consistent surface ready for polishing.