3M Hookit Soft Interface Pad, 150 mm x 5 mm, Multihole, 50545 3M Serbia 3M Hookit Soft Interface Pad 3M Hookit Soft Interface Pad 3M Soft Interface Pad 3M 50396 3M Soft Interface Disc Pad 3M United States. 3M 28322 6" 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.