3M Hookit Soft Interface Pad, 05771, 3 in, 10 per case 3M United States 3M Clean Sanding Soft Interface Disc Pad (5, 6) 3M 20278 Clean Sanding Soft Interface Disc Pad for sale online eBay Soft Interface Pad 150mm x 5mm, 2 Pack 203348 by Festool. 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.