Meguiar's S6FI Professional Unigrit 6" Foam Interface Pad 6" Foam Interface serves as a soft cushion between the backing plate and 6" Unigrit Sanding and Finishing Discs Safely follows contours and works closer to most edges Ideally engineered for use with Unigrit Sanding and Finishing Discs Allows quick disc changes with micro hook and loop attachment system Interface flexes to deliver more uniform results