3m Interface Pad 3M Clean Sanding Soft Interface Disc Pad 20278, 5 in x 1 2 in x 3 4 in 3M Hookit Soft Interface Pad, 05771 3 3M Hookit Soft Interface Pad, 150 mm x 10 mm, Multihole, Soft, 51127. 3M 20278 5" Soft Interface Pad Soft Interface Pad (to be inserted in between the backing plate and the pad), increases conformability, allowing the technician to follow contours and get in closer to most edges. Constructed of a soft durable foam. Also enables a more versatile uses with specific and more rigid pads, such as Rupes MF pads.