3m Interface Pad 3M 05771 5771 Soft Interface Pad 3" 3M Hookit Soft Interface Pad, 150 mm x Non paint Autolakken Aut 3M Hookit Soft Interface Pad, 05771, 3 in, 10 per case 3M United States. 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.